I would skip on the Blu-Ray Burner until the price of blank discs come down. And when that happens the burner will be cheaper and faster. Just get a Blu-Ray drive with a DVD burner built-in.
Newegg.com - LG Black 8X BD-ROM 16X DVD-ROM 40X CD-ROM SATA Internal Combo LG Blu-ray Reader & 16X LightScribe DVD±R DVD Burner - Blu-Ray Drives
The Zalman CPU Cooler is a poor choice, especially at $66.99. This is a much better cooler.
Thermalright Ultra-120 eXtreme Rev C. CPU Heatsink - (Socket LGA 1366 / LGA 1156** / 775 / AM2 / AM2+ / AM3 / Xeon**) - FrozenCPU.com
and you'll need a fan
Yate Loon 120mm x 25mm UV Reactive LED Fan - UV Blue (D12SH-124UB) - FrozenCPU.com
Here's a review of the new True120 C revision
Introduction - Thermalright Ultra Extreme 120 Revision B & C Review | [H]ard|OCP
Arctic Silver 5 use to be the best thermal paste, but not anymore. They haven't done any research and development while other companies have. Get this instead.
Newegg.com - Tuniq TX-2 Cooling Thermal Compound - Thermal Compound / Grease
As Hefe said, cable management isn't that hard. You'll save a lot of cash with either the Corsair 750 or 850.
The Dominators are a waste of Hard-Earned money. For less money I've got DDR3 2000 memory but unless I'm doing a massive overclock to show-off it's just not needed. For the money the OCZ Gold's or Platinum's rule the streets.
Newegg.com - OCZ Platinum 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Voltage Desktop Memory Model OCZ3P1600LV6GK - Desktop Memory
Get a SSD or (2) 7,200rpm drives and run them in Raid0. The Velociraptors are a thing of the past.
If you follow this advise you should of saved enough money to trade that GTX275 into a ATI 5780
And you probably won't use the special features in Windows 7 Ultimate. Home Premium is good for 90% of the Planet.