I have a Benelli SuperNova pump and have been quite pleased with it, except there aren't a ton of cost-effective aftermarket options. Buy with the barrel you want (18.5" Tactical model for example) because buying new barrels isn't cost effective.
I have a 26" with a long mag tube. It's robuts, reliable, shoots surprisingly well and manages recoil well with the ComfortStock. The magwell is suited for speed reloads and can be "hogged out" if you desire. I think it is an inexpensive step up from the Nova that is well worth it.
Yes I want a tuned-up M2 but I just don't shoot enough 3-gun type events to justify it and haven't adopted SG for home defense. The SuperNova has served me well though.