Would this be good for gaming ?

so im going to buy a new PC in next month and who is better at knowing what is good for gaming than you guys? thats right nobody.

so this is the specs:

CPU: Intel Core i5-3570K (3.4GHz)

CPU Fan: Akasa K25 CPU Fan (is this fan good enough for cooling the CPU?)

Ram: Crucial DDR3 BallistiX Sport 1600MHz 8GB

Motherboard: Gigabyte GA-Z77X-D3H, Socket-1155 (will this support intel processor?)

GPU: Gigabyte GeForce GTX 660Ti 2GB (is this a good graphics cart? will it run most games in High/Ultra?)

PSU: XFX ProSeries Core Edition 550W (will 550 wat be enough?)

HDD: 1 TB Western Digital (should i get a SSD if i dont have the money or could i wait?)

CASE: Corsair Carbide 500R Midi Tower White (is there plenty fan space in this?

• should i buy Win8 or Win7 Home? Win7=1000-2000 DKK Win8=500 DKK

THX for your help and time :P much appresiated*