ummmm. there is no such thing as a RF Punch Power HX2... there is the RF Punch HX2an the RF Power HX2. that being said. the rms for the punch is 600 an 1000 for the power. now if you have the these Power Punch subs, then i am guessin they are dual 2 since the old line of RF's amp were only 2ohm stable. so any amp that puts out between 1-2k watts at 2ohm then youll be good....
I had one HX2 12" in a 2.5 cube bos tuned to 30 and it was really a good sql sub.It took 1200 watts pretty good but anything more then that would make it reach full extension.
Any quality amp from kicker will do a zx1500.1 or kx1200.1 or sx 1250.1 would work well with 2 of them. If you like extremes then get a zx or kx 2500.1 for them.