Run Crysis at full settings?!? Really now, how old is Crysis?!?
The computer I built two years ago with an ASUS Striker Extreme Mobo, E6400 Core 2 Duo, 2GB OCZ Gold RAM, and 8800 GTX runs Crysis at full settings on my 1920x1200 screen.
The computer your building, if using those components, runs circles around mine. Crysis (IMHO) is no longer the most memory intensive game out there (thought it's probably still Top 5 or Top 3), you sorta missed that boat. So anyway, yea, that thing will have no problem whatsoever wiith Crysis.
I'd give you the links to the new one Im building but I dont have the time right this second and it might be well above your budget.
As far as your selection goes, its seems decent.
Personally, I always go with OCZ or Corsair memory, I've heard bad things about G.Skill, but I've also heard a few good things. I think the bad outweighs the good though. I think they are relatively new, at least to me, and personally, I don't trust them for some reason.
Your mobo is alright, alot of people like and trust Gigabyte, I just happen to prefer ASUS.
As far as your Proc goes, I think it'd be better to go i7 with the new 45nm tech, it makes a huge difference. It might be a slightly higher price, but the C2D is getting a bit old (its 65nm) and I dont think most of your games with take any advantage of having 4 cores. I would definately go with 2 faster 45nm i7 cores. Much better tech. Of course if you do this, you'll have to find a different Mobo for the new socket.
Lastly, I dont know that I really like your case, but thats more of a personal taste thing. I've never heard of the company, and there can be a massive difference is case quality and ease of installation between 2 cases that look the same. I go with Thermaltake or Lian Li usually, as do most of the people I know. Good, solid cases with easy installation.
Well, thats my take on it, but of course everyone will have a different opinion.