What FPS are there that could run ok in a pc with 1,7ghz and 2GB ram with ATI x700?

I allways liked raimbow six/rouge spear games. i like the style where you have to organize the way you go around your mission. More tactical and less fire everything that moves.

I bought rainbow six 3 (with athena sword pack) thru steam, and i like it.
It's from 2003 but i never try it before and i wanted to try it.
the game is very similar to previous ones, and graphics look the same, not a great improvement, but i really like the style.

so, apart from raibow six, what other fps games could i play with my modest laptop (1,7ghz and 2GB ram with ATI x700). I know it's not a great machine, but as example Half live 2 series run very nice on it, so i can not push to hard on details.

give me 2 or 3 fps games that i could try, doesn't matter if they are not recent. don't mind to play old games as long as they are good and have a good price.
I'm a big fan of steam, i bought 3 or 4 games from there and i really enjoy the download system they have and the possibility to download then later again.


thanks
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