A quick summary of the versions! Essentially there are only 3 FPGAs currently shipping. 02,04 and 08. Then there are a selection of cores (Retronics sells them by core) which can fit on any FPGA big enough, though technically as long as the FPGA has enough space it can fit any core.    FGPAs Logic elements Block ram Usable flash Cost FPGA only (digikey) USD