Thanks, but I'd still like to know if I'm better off trying my luck at A) ~120 Mkeys/s address search on, say, puzzle 68, or B) ~880 Pkeys/s BSGS search on, say, puzzle 135...

I mean, does it end-up being basically equal...? I can apparently search much faster on BSGS, and if the search space grows at roughly the same rate as my calc speed (or a little more), then I'd rather try for puzzle 135 since the reward is double... But if the search space for BSGS is still based (at least somewhat) on the address search range, then I'm guessing the fact that I can do "Pkeys/s" on #135 doesn't make-up for the exponential difference in search space size over #68...