I'd probably have to put Grand Maxiums MIB at the top of my grail list at the moment, I'm waiting for a trip to Japan to go proper toy hunting for him so he has extra meaning to me in the long term.
I recently got G1 Bumblejumper which was a mini grail of mine, I don't buy much anymore but there are the odd figures here and there that I think yeah, I need to chase that up, however I tend to be patient to wait for a half decent price to come along.