what lan games are good for a low end pc (specs inside)??

its spec:

intel xeon 2.2ghz

512mb ram ddr400

32 mb ati onboard rs200m (its pretty good for an onboard) 

 i know that the vid sux but just to let you know ive played sim city 4 with it as well as battlefield 1942 but bf 1942 is just 55 fps

 so my old pc is still here and i want to make use of it for lan gaming.. i already tried playing CS 1.6 on it.. and would like to try RA2: yuris revenge what else do you think is good?

No doubt, Diablo II with Lord of Destruction expansion.
Hour after hour with raw fun, action and collecting.

Or did you mean a litter newer game? :?

Counter Strike: Source

Starcraft

Any of the multitudes of Half Life mods

Jedi Knight II

Myth II