$2000.00 Gaming - Need Advice

Hello. I need advice on a few parts I'm missing for my gaming build, and would also appreciate any comments of what I currently have on my list. It's been a long 6 year wait for me to change my computer and would like to get the best I can for my budget in regards to gaming.

APPROXIMATE PURCHASE DATE: February
BUDGET RANGE: $2000.00 - $2400.00
SYSTEM USAGE: Gaming, Work
PREFERRED WEBSITE FOR PARTS: Amazon.com
OVERCLOCKING: Yes, planning to get around 3.2 - 3.4 GHz on CPU.
SLI OR CROSSFIRE: Possibly in the future.
MONITOR RESOLUTION: 1920x1080

Current Configuration:

Processor: Core i7 920 LGA1366
Motherboard: ASUS P6T
Memory: Corsair TR3X6G1600C8D Dominator 6 GB 2x3 GB Sticks
Hard Drive: Intel X25 80 GB
Second Hard Drive: Western Digital Caviar 1TB SATA Hard Drive
Operating System: Windows 7 Ultimate 64 Bit OEM
Sound Card: Creative Labs SB0570L4 Sound Blaster Audigy SE
Video Card: XFX Radeon HD 5850
Case: ---
Power Supply: Corsair CMPSU-750TX 750-Watt
Optical Drive: Samsung SH-S223L/BEBS SATA 22x
CPU Heatsink: ---

Total Cost: $1988.00

The parts I'm missing are the case and heatsink. I would really like to have a silent PC, and so having a silent heatsink and fans are an option I'm contemplating; however, I have no idea which ones are actually good.

Concerning the case, I would really like to have a sober, elegant case; the less lights and transparent panels it has the better. It's been very hard to find such a case, while also wanting superb functionality. Most of the good ones have too many bells and whistles. From what I've searched, the Lian Li cases look promising but sadly they are not sold on Amazon.

The reason why I'm buying from Amazon.com is because I don't live right now on the USA, and thus have no USA billing address. Amazon lets me ship to a POBox and use an outside billing address, while other sites, like Newegg.com, don't let you do this sadly.

Any help is greatly appreciated!