Hi Shaffaf,
Thanks very much for spec'in my tower 

I have made a minor changes just wanted to get your opinion, if you have time.
Thanks, ave a good New Year 
 
Zalman GT1000 Z-Machine Case - Black (No PSU)	
Intel Core 2 Quad Q9550 LGA775 'Yorkfield' 2.83GHz 12MB-cache (1333FSB) Processor 
(Is this much better then the Q6600)
Powercolor ATI Radeon HD 4870 1024MB GDDR5 TV-Out/Dual DVI/HDMI (PCI-Express)
Asus P5Q Deluxe Intel P45 (Socket 775) PCI-Express DDR2 Motherboard 
(Is this better then the Gigabyte?)
Corsair TX 750W ATX2.2 SLI Compliant PSU	Corsair TX 750W ATX2.2 SLI Compliant PSU		
OCZ 4GB (2x2GB) PC2-8500C5 1066MHz Dual Channel Platinum Series DDR2 (OCZ2P10664GK)	
Zalman CNPS9700-NT nVidia Tritium CPU Cooler (Socket 754/939/940/AM2/LGA775)	
Seagate Barracuda 7200.11 500GB SATA-II 32MB Cache - OEM (ST3500320AS)	
Sony NEC Optiarc DRU-V200S 20x DVD±RW SATA Dual Layer ReWriter (Black/Silver)