New Build Advice Request

Hi all, so I am a few weeks from building a new rig for mainly gaming at a reasonable budget. Before I get to questions lets gets straight onto the good bit with the parts I am looking at atm.

Case - Antec 300

http://www.ebuyer.com/product/143854]

Motherboard - Gigabyte GA-X48-DS4 iX48

http://www.ebuyer.com/product/145368

Processor - Intel Q6600

http://www.ebuyer.com/product/131823

RAM - Kingston 4GB (2x2GB) DDR2 1066MHz/PC2-8500 HyperX Memory CL5 2.2V

http://www.ebuyer.com/product/148859

Gigabyte HD 4770 512MB GDDR5 Dual DVI HDTV Out PCI-E Graphics Card

http://www.ebuyer.com/product/165178

Hard Drive - BARRACUDA 7200.12 750GB - 3.5IN 7200RPM 32MB SATA/300

http://www.ebuyer.com/product/159612

Cooling Fan - ZALMAN CNPS 8000 Socket 754, 940, 775 & 939 CPU Cooler

http://www.ebuyer.com/product/116411

Power Supply - Kingwin 600W Modular PSU - 4x SATA, 2x PCI express

http://www.ebuyer.com/product/132280


and a sata disk drive from LG.

So here are my questions, Originally I was thinking of going with one of the new phenom chips, are there any advantages/ disadvantages to either, and if it was you which would you choose?

I have picked the motherboard specifically so I can add a second 4770 later on. With this in mind does anyone know if there will be any problems with the antec case when it come to room. ie will both cards fir in ok?

Do you think the power supply will be good enough to run the system both at the start and once the second graphics card is added.

Any other advice or possible changes are welcome.

thanks.

Kev.