I run the EPS2s with the INT-30A. The Montanas are 92/4, so not too greedy, and the Pass's 30 watts drives them pretty well. But: I don't go too loud (say, 80-85db peaks), and my system does not have as much grunt in the low end as when I used the 180 wpc Odyssey dual mono.
Note that the Montana's are pretty "laid back" speakers. They are extremely listenable, without a touch of edginess in the highs; perhaps relatedly, they are not detail/imaging monsters, though they fare prety well on this score. Nor are they massively deep in bass, especially for 150 lb. speakers. In short, if you want audiophile pyrotechnics, they might not be for you; if you want unobtrusive musicality, they might be. I think they are excellent speakers, and superior to numerous more expensive models that get a lot of love around here. They can be found at good prices; you might give Peter N, who is a helpful guy, a call.
With the 30 watt Pass, I believe my system is well tailored to "small" music (Girl with Guitar, small jazz combo), played at lower volumes. (The EPS2s sound very good played soft). If your musical tastes tend this way, you'd likely find the combo rewarding.
If you already own the 350.5, I'd expect that to work well too; the amps Peter N. builds for his speakers are big solid state beasts.
A final plus is that the EPS2s, while pretty large, play well close to boundaries; that and the nice box work make them decor friendly, despite their size.
John