SilverStone FT02 (~$259) - An amazing case that looks great and performs even better. Extremely good at air cooling and also allows nice water cooling setups. If you want to go all out, the Silverstone TJ07 is around $100 more but is even better.
Core i5 2500k - Since you're mainly interested in gaming there is no need for a 2600k. Hyperthreading is nice but it produces more heat when enabled and provides virtually no performance gain in games. If you want to go all out, get the 2600k for $100 more and you'll see 1-2FPS more in games
Thermalright Silver Arrow or Corsair H100. This one is tricky. The Silver Arrow is HUGE but it's one of the best air coolers (top 3) and is very quiet. The H100 does not perform as well as the Silver Arrow but is a very nice self contained liquid cooling kit and takes up a lot less room. You said you were switching to liquid cooling so this decision isn't too important.
Scythe GentleTyphoon (AP14 or AP15) - Godly fans with extremely good performance and relatively silent.
EVGA P67 SLI or Asus P8Z68-V pro. The EVGA P67 seems like a great board and I've heard good things about it. I personally have the P8Z68-V pro and love it to death. Both are great boards.
eVGA GeForce GTX 580 - Great GPU by a great company that tears through everything out there. In the future you can add a 2nd one if you need to.
120GB Corsair Force GT - One of (if not the) fastest SSD out there right now.
CORSAIR Professional Series Gold AX850 - Spectacular PSU. Jump to 1KW if you want to go all out and get a 2nd GTX 580 later.
G.SKILL Ripjaws Series 8GB - Very good ram.
The rest doesn't really matter too much, get HDs/blu-ray/DVD based on your needs.Edited by nezzarix - 8/9/11 at 9:17am