i would like to buy a bino telescope/telescope binocular?

One never knows what level people are asking about in terms of expenditure: depends on the person asking. Binocular viewing is its own "aesthetic" and people that "get into it" are somewhat different from telescope viewers. The two best quality "reasonable alternatives" on the market are made by Vixen. The links below are to the 125mm and the 80mm at two different vendors.

http://telescopes.net/doc/2500/mftr/Vixen/item/1436

http://www.astronomics.com/main/product.asp/catalog_name/Astronomics/category_name/CUJ52QSW9PGJ9MTQ2QU8593HR1/product_id/BT80A

Now you'll need a good mount on top of the optic so all things considered you're looking at $1500 to $4500 depending on how you trick it out. Some people consider that reasonable others don't. High end binocular telescopes by Takahashi and others can go for something like $10,000 and more. I remember seeing them on line at Anacortes Telescope and Wild Bird, not too many places carry them.

For Saturn's rings 30x is considered the *minimum magnification* at which the rings become visible. The moon is easy.

A somewhat different way to get the "bino effect" is to put a binoviewer on a regular telescope. This takes the light and splits it into two beams one for each eye. People who like binoviewers say you get better detail, and that's true as far as I can see, but they mean mostly on the moon and planets. In terms of actual image brightness you lose out: I would not use one for deep sky because, when I tried it, I noted that a lot of stars disappeared which I could see with the binoviewer removed.

Good inexpensive binoviewers are sold by Stellarvue but the best ones are Denkmeiers and Baader (sold by Astro-physics). We're talking $300 to $2,000 for binoviewers in addition to the investment needed to get a telescope.

I personally don't think there's much satisfaction to be had on observing the sky with much less than a four inch (102mm) aperture. An 80mm scope just doesn't do it for me, and binoculars just don't do the trick. I also find them uncomfortable to use on a tripod and difficult to use hand held. You can get image stabilized binoculars which are pretty cool, but expensive.

If you want a nice wide-sky bright image effect with a stable mount and reasonable outlay get the Orion Star Blast telescope (www.telescope.com) for $175 and buy the $300 24mm Pan Optic eyepiece to use in it. This gives a very wide low power view and is much easier to use than binoculars; it is a "high quality view" and "easy on the eye" which is why we're talking about that $300 eyepiece (you can use it without a $300 eyepiece to good effect, but I'm trying to set you up with a real good substitute for binoculars). This telescope will come with a 20 and 10mm eyepiece that you can use to boost the power high enough to see Saturn's rings. The scope does not *excel* at high power views but it certainly will get you up to 60x, 80x for a gander at the rings and you'll have the aperture to get some brightness. Also the color correction will be superior to most binoculars and refractors. I have had people come to star parties where we had huge expensive telescopes of all kinds and the newcomers looking for something to buy have been most impressed by the inexpensiveness, quality, and portability of this small instrument.

You can buy the Star Blast and Pan Optic at

http://highpointscientific.com

where it sells for less than at Orion! (shipping is a lot less at highpoint)

Orion is

http://telescope.com

After you've used this scope for a while you'll probably want to graduate to a six to eight inch Newtonian, but the Star Blast is a keeper. We put it out on a small table on Halloween and blew trick or treaters away with views of Comet Holmes.

As a final point you can get decent large size binoculars from Celestron and they're not too pricey, you can get astronomy sized binoculars from Highpoint, Orion, and many other on-line vendors. I think that the Star Blast is a better deal because of the stability of the mount and its much easier to use for an hour or two. You can pick it up and haul it outside with one hand. The field of view (with a 24 Pan Optic or a 32mm Plossl, which is a cheaper way to get a large field of view) is over 3 degrees, almost up to binocular level, and large enough that you can "relate what you see in the scope" to what you see in the sky. Give Highpoint a call and tell 'em some person on the 'net was recommending a Star Blast and 24 Pan Optic as an alternative to binoculars and see what they say.

Hope that helps,

GN

Any instrument like you describe, able to show the rings of Saturn, would be quite expensive. For detailed views of Saturn, the Moon, etc. at a reasonable price, you really need to get a normal telescope like one of these:
http://www.telescope.com/control/category/~category_id=dobsonians/~pcategory=telescopes/~VIEW_INDEX=0/~VIEW_SIZE=1000000
http://www.skywatchertelescope.net/swtinc/product.php?class1=1&class2=106

Bigger aperture is always better; bigger magnification is limited by the quality of the optics, the steadiness of the Earth's atmosphere, and the solidity of your mount. I own 15x70 binoculars but rarely use them, preferring 10x50 for quick hand-held wide-field views, and one of my telescopes for highly magnified views of fine detail.

The next usual step in working up in this hobby is to use a good pair of binoculars. They should have Bak4 lens and be fully multicoated. Get 7 to 10 x 50 unless you want a mounted set. If you have support you might want to try a 25 x 100. I wouldn't get zoom because there might be a trade off in light loss or quality.