I prefer Memphis Audio.
It's a little pricey but are long lasting, well made.
Make sure you choose by RMS and not Max Watts.
You can get a 2000 watt amp and it will only push 120 RMS.
I have a 1000 RMS amp. I can't imagine how high the max is but its irrelevant.
Hope that helps.
Oh and if price is a problem.
I recommend Lightning Audio.