Counter Counter Strike

On the outskirts of the savage jungle i´m living in, my cousin operates a cyber cafe. It´s completely overrun with the kids of the neighborhood who play Counter Strike ALL DAY, and as i type, the 2 PCs next to me and the 3 behind are all blazing guns with terrorists.

Since i game and come from ''The Power Up North'', i wanted to suggest 1 or 2 new games for them to make some extra dough. Something as exciting as Counter Strike but not so intense as to warrant a total overhaul of the machines. I thought of Half Life 2, but they already have Half Life and it´s not too popular. I´m thinking another FPS that´s more recent yet a few years old to ensure decent performance.

I´m not a PC gamer at all, so i need y´all to gimme some good-uns. Doesn´t need to be FPS, just as long as it´s a few years old, won´t crush the CPU, and is fun. They also have Gunbound, to sort of give you a picture of what they like. Shooting and death. Y´know, cutesy stuff.

PS- NO RTS.

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Update- I wrote this a few days ago but the time ran out before i got to post it. Give me what you can in these last 30-somethin hours.