good shooter games??

what are some good cheap(older) shooter games, also would be nice if they had online multiplayer. new ones are good too good shooter games??
SOCOM FTB 1 %26 2 and Star Wars Battlefront: Renegade Squadron. I'd choose SOCOM though, less online hackers.good shooter games??
Along with the games mentioned above, Medal of Honor Heroes is cheap, and it has good online multiplayer too.
Either of the Syphon Filters, Killzone Liberation, Any of the Socoms.I wouldn't go with Star Wars RS though. The game is completely ruined by hackers..

zits