i7 with it for future games and rendering?

[MonsterMoshi]

I will be getting an ivybridge cpu when they are released and i'm debating between the i5 and i7....
The PC has to last me at least 3 years most likely around 5.
Main use right now at least, is games. But i do some 3d modeling and rendering and i am likely to be doing more of that as time moves on.
I know the i5 is a very capable CPU but i'm wandering if in the long term it is worth spending the extra £100-ish to get the 3770K over the 3570K
Do you think future games will work with hyperthreading? Is it going to give a noticeable performance difference over the i5 in 3D rendering applications?

Thanks

 

[MonsterMoshi]

Sweet. Thanks for that link
The main thing is that there are no circumstances (at least in bench marking) where the i7 falls short so i wouldn't be losing out. It does give a pretty solid performance increase in most cases too and many times better than my Q6600
I just think i may find my self itching to get an i7 later on if i don't do it now anyway