I would also recommend a 2x12". If you want the Fatness of 15" and the Speed and Response from 10", go with the 12". I also use a 2x12"+Horn Cab with my 700RB-II and it sound sooooo nice. Fat, warm and detailed. I would guess the GK Neo 212 Cab is a great Cab.
Link Removed
See Norm Stockton with the GKRB Amp and the Neo212 Cab.
Norm Stockton wit GK Rig
Link Removed
See Norm Stockton with the GKRB Amp and the Neo212 Cab.
Norm Stockton wit GK Rig