I've been using my AD200b with a single SVT112AV. Sounds great at medium to low-volume jams and recording. I too, wonder if the OBC115 would be a "better" pairing, but the weight of that cab is a turnoff to me.
I totaly agree with you about the weight of these cabs with the stock speakers. But after replacing them with some Eminence Deltalite 2515's, it has made them MUCH more manageable and they sound great!