thing is, if you really want to be all about the theoretical performance numbers, quad crossfire should do insanely well in 3dmark. would amd holding all the top 50 spots in 3dmark somehow make it faster in day to day use? not at all.
like i said, for an encoder, or maybe some 3dsmax guys intel will prove faster.
if you can be honest with yourself and gaming is all you do, you won't find a £50 dual core any slower than a £600 phenom(when/if available) or a £600 penryn. thats fact, provable in every high res games benchmark over the past 4 years bar maybe 1% of games.
the only reason to go quad core now is if you won't upgrade anytime soon, its a fairly easy argument to make, for long term performance without upgrading quad core will easily be faster than dual core, that is the only argument for the majority of peopl e. in gaming amd aren't slower, then manage to go clock for clock in a few other apps aswell.
as i said, i've got a Q6600 at 3.8GHz now, its fine, i want a phenom to play with, thats all really. but crysis for me isn't faster at 3.8Ghz, than it is at 2.8Ghz, and i've not tried at stock but its unlikely to be different at 2.4Ghz.
intel shouldn't be a problem for dual crossfire, honestly got no idea if they support sli but assume they do. i honestly believe that most people just wouldn't be able to tell the difference between a 2.4Ghz phenom and a 3.2Ghz penryn, or a 3.2Ghz phenom and a 2.4Ghz kentsfield either, or a 3.5Ghz phenom and a £50 c2d either.
but if no one buys amd, purely because theoretical performance in a few apps you won't use isn't as good, then AMD won't have any money to make the next competitive chip as good as we need it to be. Intel are a business, they will increase prices if AMD stop getting even close to competitive.
errm, there was also talk, and i think maybe a mention on the amd page somewhere of discount phenom + 3850/3870 bundles maybe. which coupled with a higher spec cheaper amd mobo could result in some killer quad core bundles which would be very good for most people and long term performance systems.