Shimano is all bonered up about their Torsa line of reels, pimping them as the ultimate jigging reels. I don't like the looks of the reels, with that big clunky gear on the side, but I haven't used them at all either. They claim that they're very powerful for their size.
Regarding grouper fishing and keeping them out of the rocks, I fish nothing less than 80# main line. I like to have the ass to haul them away from the rocks in a hurry. You can't do that with 50#, unless the groupers aren't that big, or the bottom is relatively benign. Nasty, dynamic, jagged bottom is not the place for finesse fishing.