Why go with DDR3 though? It's expensive and utter crap atm. Do you want to pay 300% extra to get an 8-10% performance boost?
Wait a year or so before making the DDR3 jump.
Any P35 based mobo will do ya. I have a Gigabyte one and am smoking my friends DDR3 rig. He spent the extra cash on DDR3 ram, where I bought a better VC and more DDR2 ram. Our systems came up to just under 2 grand each. Mine SMOKES his in every test and gameplay. Sad really. Yes with DDR3 you "future proof" yourself but come on... Why pay extra now and get a sub par product when you will be able to get it cheaper later and have it be much better?
He is moaning and complaining that his system cost $75 more and just pales compared to mine, but then again he HAD to have DDR3, where I went with DDR2 (and mroe of it).
If price doesn't matter, go for DDR3 (and send me some money!)