I have 6 spartan6x150's in the mail headed my way to do some testing with.  I have the PCI-e board sketched up on KiCad, and am going to contact a PCB manufacture tomorrow about getting a few made. If all goes well, I'll post the board schematics on here for public use.

For those intrested, DigiKey is selling spartan6x150 singles for $158/chip and $170/chip (same chip, just 2 different batches), just search for "XC6SLX150".

My current board design is PCI-e x16, double wide to fit a wide heatsink and fan in.

I'm also in contact with a rep from Achronix, hoping for a low-ish estimate on their HD1000 series of FPGAs (sub $1,500/chip), but I doubt it.

Thoughts, ideas, opinions?