^What are the components that you have currently ?
and you would have noticed from those reviews that SLI support for LGA 775 is not so good as crossfire support...And the SLI is done best on a X58(i7) mobo...
Why would you UPGRADE to a dead socket? Socket 775 is dead. You will never be able to upgrade it.
Wait for the i5's in a couple months, it'll be even cheaper than a C2Q.
i believe the only difference will be the cpu socket and the ram, therefore you would have to focus on those two mainly.
Perhaps a Asus P6T and a Core i7 920 and ddr3 ram of your choice
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