Windows 7 64bit - Should I get it?

Well I might go with 1TB x2. though RAID is something to look at definitely.

I will be getting (in January) another OCZ Vertex Series 120GB 2.5" SATA-II Solid State Hard Drive as i intend going RAID 0 on my main Computer using Intel Matrix Storage and 128KB stripe, should be fast !

DaGreatPanda, you'll not regret building a 64 bit computer. It's the future, as there will come a time when 32 bit OS's and programs are gone. It won't happen all at once, but it will happen. I have a new 64 bit PC and am happy with it. You will be, too. Welcome to the forums and hope you enjoy your stay!