Ahh, from your wishlist you showed just single socket so thats what I replied with.
Honestly, dual socket isn't cheap to do.
A top dual socket 1366 board is $400.00 but the killer is the cpu cost.
The top W5580(3200mhz Gainestown) cpu's are app $1850.00 each.
So $3700 for cpu's,$400 for board and minimum of $150.00 for 6x1 gig DDR3-1333 ECC from Kingston.
That's $4250.00 right there and you need a good 750w PSU,drive,case,etc..A $5000.00 build.
Now you could go with the E5520(2260mhz Gainestowns) and cut $2800.00 from that price as they are $379 each at Newegg as of today.
Very nice machine but I'm back to a single socket i7-920 on a good gaming board is the best bang for the buck.

My board is a Supermicro X8DA3.. Solid board and dependable;
http://www.supermicro.com/products/motherboard/QPI/5500/X8DA3.cfm