Look at the 2500.1 and the 1500.1 Difference is going to be RMS, and of course, price.
Figure out which is in your budget, what you want to do the with CVXs, and then start looking for a good deal on one. The 2500.1 can do more RMS than the subs will handle, it will be up to you to keep it down and not smoke the subs. The 1500.1 is just a bit under all three subs RMS combined handling, but as long as the amp sees voltage and you don't let it get hot, shouldn't have any failures due to power on the subs.