Dailytech has a list of sites which reviewed the core i7. check your favourite site from the list here.
DailyTech - 11/3/2008 Daily Hardware Reviews -- Intel Core i7 940, 920 and 965 Extreme Edition
from the guru3d link
Core i7 920 at 284 USD (mainstream)
Core i7 940 at 562 USD (performance)
Core i7 965 Extreme at 999 USD (enthusiast)
also check this
Core i7 Multi-GPU SLI Crossfire Game performance review
DailyTech - 11/3/2008 Daily Hardware Reviews -- Intel Core i7 940, 920 and 965 Extreme Edition
from the guru3d link
Core i7 920 at 284 USD (mainstream)
Core i7 940 at 562 USD (performance)
Core i7 965 Extreme at 999 USD (enthusiast)
also check this
Core i7 Multi-GPU SLI Crossfire Game performance review