Which GPU to pick?

So I got my sig rig below and I wanna upgrade my graphics card.

I plan on getting 1 graphics card now and a new 22" 1920x1080 monitor in a week. Then in a month or so get another GPU to SLI/Crossfire.

I am leaning towards Nvidia because I like their brands, EVGA, BFG, XFX better and they have Physx for games like Mirrors Edge.

I also plan on watercooling the card(s) with some swiftech mcw-60 or dtek fuzion blocks and add another MCR220 in my loop, so heat shouldn't be a huge problem.

So provide me info on why which card is better or benchmark links.

Option 1 - GTX 260 and in a month or so SLI 260's
Option 2 - GTX 285 and MAYBE SLI in a couple months
Option 3 - 4870 512mb and then Crossfire
Option 4 - 4870 1gb and Crossfire
Option 5 - Suggest me a setup

Games I play and plan to play
F.E.A.R. 2, Far Cry 2, Fallout 3, Crysis, Crysis Warhead, Mirror's Edge, RSV2