"and also you'll need 4 STICKS of RAM! To run 4x4 (two for each processor)"
Not really in fact even one should work (not recommended).
The 4x4 will look similar to this (Only one processor gets RAM):
http://www.tyan.com/products/html/tigerk8w.html
http://www.tyan.com/products/html/thunderh1000e.html
http://www.msi.com.tw/program/products/mainboard/mbd/pro_mbd_detail.php?UID=669
Not like you said that would look like this:
http://www.tyan.com/products/html/thundern3600b.html
The 4x4 will have to keep design simple, to keep it cheap.
If Intel came with quad core for 1000$ or AMD with two dual for 1000$, I think there will be no problem with either solution.
Power consuming should be low like Jumping Jack said. Intel had (still as) the 840EE and others that consume much more power than any of Intel or AMD future solution. So power consuming won’t be a problem.
Off topic: How much energy does the "recommended" toms PD805 OC uses?