Mono Amps

Here's what I am going to be doing. I am going to put a single 15 and I was told to get a Phoenix Gold 500 Watt Mono Amp. After talking to a few friends, they suggested going with MTX or JL. The guys installing the sub say Phoenix Gold.

Does anyone have any ideas on a good 500w Mono amp to buy? Is Phoenix Gold a good amp? What are some others you think I should go with. I am not too worried about the price. I am more worried about the quality and power. Any help you can give me would be great... Thanks in advance