Synthury,
It depends on what you want to do. To me the main issue in your predicament would be deciphering whether or not sequencing is that important to you. If not, then the Summit is a very wide range synth that I would think could cover REV2 territory. I had looked at getting a REV2, but I was already overdosing in sequencers
I'm not sure I agree with some of the comments about the keybed being bad or having a "plastic" feel. From my perspective there is nothing about the build on this synth that feels cheaply that way to me. I'm comparing it to other brands I have and the DSI line I've owned. It's all relative to each person I guess. I know piano players like a stiffer heavier key. Whereas I never played piano, so I do not.
I should mention that I was pretty critical of the Summit aftertouch at first, but have since learned some of that was my own fault in programming it. I mean its still a little stiff, but not much more so than many other synths. I noticed if you place fingers in middle of key, versus the ends, there's a better response. Its interesting , because I'm always disappointed in AT response on each of the instruments I've had, with exception of the PO8 and DM12. Its entirely due to the keybed apparently, as when I hook up the Linn controller they all seem to respond well.
In general, the Summit is warming on me. I'm starting to figure out what it's niche might be (for me). I think big pads, dreamy voicey stuff too. Novation absolutely needs to modify the ability to create multi-layered patches though, whereas you can flip layer A/B with each other. Also you should be able to import any single patch from elsewhere in the instrument memory to a multi layer patch. This does not seem to be possible which is crazy. in fact, so bothersome that you cant even copy layer B to layer A (from what I can figure out) that I haven't even been motivated to do multi- layer patches yet! P12 has a much better grasp in this regard. I would think an Summit OS update might fix this oversight.