I would stick with a known high quality manufacturer like corsair or crucial or patriot etc
make sure you are getting performance ram sticks that show the specs of Cas4 (4-4-4-12) with volt ratings of 2.1 volts or more DDR2-800 / PC6400
like these
http://cgi.ebay.com/Corsair-XMS-2GB-...QQcmdZViewItem