A guy in our group has a 20ga 11-87 and aside from taking the butt of some jokes about the sound of his gun (poof) compared to the 12ga's... he seems to be pretty good for at least 1 deer/season. It's featherweight, he has a fully rifled barrel and shoots copper solid sabots. He had an issue with a spring a few years back, but pretty good otherwise.
Not sure what your intention (style of hunting) is... but there are some good reviews on here re: the NEF 20ga. Ultra Slug Hunter (price and accuracy). Only drawback perhaps for you.... it's pretty much a niche gun for deer (single shot)