Hey GPUHoarder, thanks for the insightful posts. What chips would you use with 2-3x the LUTs for the same cost? Wouldn't smaller chips have a much lower frequency too? Downloading a table from Digikey the best I can get is a lattice LFE5U-85F-6BG554C; $0.4/kLUT, probably 0.60 by the time you add board assembly power etc. Without the 6-inputs LUT and at a much lower frequency. Reballed Virtex chips maybe?