Fateh Ji
What is your budget firstly..
Also - with regards to i7, i have built a few beastly gaming machines with i7 processors recently for a client, they have improved the archictecture immensely recently and its very stable and works a charm... so dont rule it out, its just a matter of you being prepared to try it out.
Add me on msn if you want to talk further about i7 and other hardware - i have in depth and strong hardware and software knowledge and have been working the field for a few years.
Id be more than happy to give you any advise if needed
Look forward to hearing from you
Fateh Ji