Ctmorsejr, keep in mind that it is by no means a given that the results you will get with and active cross-over and stereo subs is going to be superior than mono subs, using bass management.
I have Avalon Eidolon visions and 2 x JL 113, and was thinking exactly like you. So I got myself a Trinnov 4 channel room correction + bass management + cross-over processor unit, probably the most sophisticated (professional) box on the market for this application.
I then created a preset with active cross-over, integrated subs with mains, effectively creating a 4 way fully discrete 2.0 system, with the subs now part of the FL/FR channels. I also created a preset with 2 mono subs using bass management (cross-over a 90Hz). Much to my surprises, the bass managed configuration sounds better (to me). The reason is in room bass response is extremely unpredictable, and it may just be the case mono subs result in better cancellation of room modes.