Re: Which amp would work best for me?
The sub you have can be wired to either 2Ω or 8Ω. For car audio, 2Ω is the best choice since car audio amps are rated for 4Ω and lower impedances.
All of the amps you listed, except the last one, are rated for 250 watts at 2Ω. The last one is rated for 300 watts at 1Ω ad only 150 watts at 2Ω, so you'd never see 300 watts from it, given that your sub can only be wired down to 2Ω.
With that said, the first three amps would work fine for you, although I would recommend buying an amp that will do what you want at 2Ω and is also 1Ω stable. The reason why is in case you decide you want more in the future... you could just add another sub but still keep the same amp.
The CT Sounds AT500.1 is rated at 600 watts into 1Ω and 300 watts into 2Ω, so it fits that scenario nicely. And since I'm a CT Sounds dealer, that's the only thing I'm gonna recommend, although there are plenty of other amps that will do what you need. ;-)
As for over powering a sub, there is nothing at all wrong with it but unless you have a pretty clear understanding of the implications, I don't recommend over powering by more than ~25%, to be safe.
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