Ya, I was anticipating picking up one (16 GB mobo) used on eBay or the like.
I just realized I'd have to buy new 4 x 4 GB memory modules for the project I had in mind and since that'll cost me over $300 I might as well build a new Core i7 machine that'll run 32 GB of memory.
Thanks for your help!
P.S. - In case anyone was wondering, I'm trying to upgrade my ESXi 5 server (for cheap as possible) so I can run more VMs (my current host machine maxes out at 8 GB).