I'm somewhat familiar with your speakers, I own a pair of the Montana EPX speakers. While I don't doubt that the Benchmark AHB2 amp will do a nice job with your Montana speakers I would opt out for the M700 monoblocks if they are within your budget. I believe you would not have any regrets or wonder how much better would the other amp sound.
New Amp Choice (A or B)
So I'm considering a new amp to go between my Benchmark HPA4 preamp and Montana XP speakers. My 2 choices are The Benchmark AHB2 amp, or the PS Audio M700 mono amps. My speakers are 92 db/W at 4 Ohms, but I was wondering if the Benchmark was enough power, or if the M700' were a better fit with my 7 driver speakers. Normal listening... never killer loud. My current amp is just an old Adcom filling in.