I went to buy a new computer.

CPU︰AMD　AM2 X2 DUAL CORE ADO4200-CU CPU 低電壓　$1,230
Motherboard︰ASUSTek　M2N-E/AM2 nForce 570 Ultra M/B　$730
Ram︰Super Talent　DDR-2 667MHZ 2G Ram (1Gx2)　$1150(Price @ Capital)
Harddisk︰Seagate　250.0GB ST3250820/24AS SATAII/NCQ HD　$568
Display Card︰Sapphire藍寶石　X1950Pro Ultimate PCI-E 256MB　$1,530
DVD-RW︰Pioneer　DVR-A11XLA 16X DVD+/-RW　$349
TV Card︰COMPRO啟視錄　X500 TV Card Nicam,多制式,FM　$410
Sound Card︰Creative　Sound Blaster LIVE! 24-Bit External　$398
Power Supply︰DELTA　ServerPower 460W GPS-460BA-102A P.S.　$510
Case︰$200
Total︰$7,075
This computer is very enough for doing these things. For the rest $425~You may use to buy a good speaker to satisfy your vision and hearing enjoyment.
If you want to but a LCD monitor also, there is another suggestion for you.
CPU︰AMD　AM2 X2 DUAL CORE ADO3800-CU CPU 低電壓　$1,032
Motherboard︰ASUSTek　M2N-E/AM2 nForce 570 Ultra M/B　$730
Ram︰Super Talent　DDR-2 667MHZ 2G Ram (1Gx2)　$1150(Price @ Capital)
Harddisk︰Seagate　250.0GB ST3250820/24AS SATAII/NCQ HD　$568
Display Card︰Galaxy影馳　GF 7900GS 超頻3 PCI-E 256MB DDR3　$1,150
DVD-RW︰ASUSTek　DRW-1608P3S 16X DVD+/-RW 盒裝　$242
TV Card︰COMPRO啟視錄　X350 TV Card Nicam,多制式　$330
Power Supply︰Seventeam　420W ST-420BKP Power Supply　$370
Case︰$200
19 inch LCD monitor︰$1,700
Total︰$7,472