What are the difference between these RAM???

My computer is fujitsu lifebook v1020wu.
Its RAM　ｉｓ2GB DDR2 667 MHz (max. 4GB)。　Ｉ　ｗａｎｎａ　ｔｏ　ａｄｄ　ｏｎｅ　ｍｏｒｅ　２ＧＢ RAM　ｉｎ　ｉｔ。。

ＨＯｗ　ｔｏ　ｓｅｌｅｃｔ　ｂｅｔｗｅｅｎ　ｔｈｅ　ｆｏｌｌｏｗｉｎｇ？？
[NB] A-DATA DDR2 667MHz 2G SODIMM
[NB] Corsair DDR2 667 2G SODIMM (MAC)
[NB] Corsair DDR2 667MHz 2G SODIMM
[NB] KingMax DDR2 667MHz 2G SODIMM
[NB] Kingston DDR2 667MHz 2G SODIMM
[NB] OCZ DDR2 667MHz 2G SODIMM OCZ2MV6672G
[NB] Samsung DDR2 667MHz 2G SODIMM (原裝)
[NB] Transcend DDR2 667MHz 2G SODIMM
A-DATA DDR-2 667MHZ 2G Ram
A-DATA DDR-2 667MHz 2G Ram W/ECC+REG
A-DATA DDR-2 667MHz 2G W/ECC FBDIMM
A-DATA DDR-2 667MHz 2G W/ECC only
AENEON DDR-2 667Mhz 2G Ram
Corsair CM72DD2048R-667 2G DDR2 w/ECC+REG
Corsair DDR-2 667Mhz 2G Ram -VS2GB667D2
Geil GX22GB5300DC DDR2 667 2G Kit 連銀色散熱片(1Gx2)
Geil GX22GB5300SDC DDR2 667 Ultra 2G Kit 連橙色散熱片(1Gx2)
KingMax DDR-2 667MHZ 2G Ram
Kingston DDR-2 667MHz 2G Ram
Kingston DDR-2 667MHz 2G W/ECC FBDIMM
Kingston DDR-2 667MHz 2G W/ECC only
OCZ OCZ26672048VDC-K DDR2 667 2G Kit (1Gx2)
OCZ OCZ26672048VPDC-K DDR2 667 2G Kit (1Gx2)
OCZ OCZ2SE6672GK DDR2 667 2G Kit (1Gx2)
OCZ OCZ2VU6672G DDR2 667 2G Ram
Transcend DDR-2 667MHZ 2G Ram
Transcend DDR-2 667MHz 2G W/ECC FBDIMM

Ｐｌｅａｓｅ　ｈｅｌｐ　ｉｆ　ｙｏｕ　ｋｎｏｗ。。ｔｈａｎｋｓ　ａ　ｌｏｔ