Unfortunately the pricing gap between the Nehalem Xeon CPU series and the Core i7 at same clock speeds will seriously hinder the value of the upcoming Gainstowns if leaked pricelists are to believed (i940=~$570 vs. X5570=~$1300).
On the positive side the Thurley platform should provide better power efficiency and compatibility with the Core i7 i.e. using the same HSF, RAM, SouthBridge. Although RAM will probably have to be buffered and registered but the cost is incremental and heat dissipation should be much less than the current FBDIMMs used by the DPs now.
Perhaps a Skulltrail Extreme

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