15 is borderline with the classic valves highest capabilities. I dont think you will even be able to reach that without an electro frame with that trigger pull. Although I have never tried it with an RT on/off
I price isnt that much of a hold back then I suggest you go with an X-valve or some later versions of it with a ULT, Intelli (or Y if you can afford/get ahold of one) frame, and I would say a basic 850 psi since the ULT prevents you from going "vetter fast" unless you add to many shims although that is bad. This gives you a nice almost electro feel and is simply limited to how fast you can pull the trigger.
Buy one used or build one new for $500 some dollars. I suggest going over on AO and buy a nice mag new. There are plenty like the one you are looking for that are always popping up for sale. and its usually cheaper and better than new.