As for monitors, with that range of games I'd be reluctant to recommend anything, especially under those budget restraints. I personally use a Alienware OptX™ AW2310 23"W and am reasonably happy, however I'm really looking for something that is 120hz, 3D capable and LED backlit with a VESA mount.
Samsung's SA950 is a really nice monitor. I've got the Samsung and the BenQ XL2410T and I prefer the Samsung; the picture quality and colours are much nicer, although the BenQ's stand is excellent and both are very good for gaming.
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