If you get STALKER, I highly recommend that you installed the STALKER Complete mod before you play it the first time. It keeps the basic gameplay (which other mods don't do) and fixes a ton of bugs and other annoyances that detracted from the original game. STALKER is a really great series, but it's had technical problems holding it back. Only the third game (Call of Pripyat) is really of 'finished' quality OOB. I actually recommend that you play the first game with the Complete mod, then skip right to the third game. Don't bother with the second (it's a prequel anyway and not a continuous part of the storyline).
If the above discourages you, let me say that STALKER is one of the best FPS experiences I've ever had. A great original setting, very challenging gameplay, and lots of good rewards.
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