Sundown SAZ-1000D. It's about $350ish I believe. I'm sure the OP has not heard of them, but they are AMAZING amps and customer service is top notch. Anyone here will back them up.
Just make sure you are with in your impedance, with any of the name brands you listed you will be happy with. Its not like your going to get a major name brand amp and it will sound like ****.