Although the single cpu is nice I think that with the duel cpu boards with their 16 dimms you can use 2G ram sticks and get 32 gig and get the "holy grail" of MBing of putting the whole wow folder in ram with 32G.

$385 for a 16 Dimm board but E-ATX form factor so might need a new case.

http://www.8anet.com/ShowProduct.aspx?pid=7944


Well 2G chips are like $45 each and a 4G ddr3 is like $130

http://cgi.ebay.com/NEW-HYNIX-MEMORY...item4a9fe6906b


Well I think overall the duel cpu board is best cause at the end of the day if you decide to upgrade you just toss in another cpu lol ...