Thanks guys.
The provided link seems to show a general consensus that 860 is marginally better than 920.
What about 860 vs 930 though?
P.S. I cracked after waiting 3 months for Arrandale MBPs. Ordered my i7 iMac just a few hours ago.
You USA'ers are so lucky! $2200USD for iMacs on eBay!
I have to pay $3200AUD for my iMac ($2950USD).