^^^ what Tractor said.
I've noticed that the high ratings that audio manufacturers have been claiming lately has been misleading people. A sub capable of 1000 watts peak isn't necessarily better than a sub that is capable of 500 watts peak, especially if you are comparing a flea market special brand sub to a Cerwin Vega or Image Dynamics sub.
A good rule for power, is to get an amp that will put out more RMS power than what your sub(s) will handle. That way, you can turn down the gains on the amp to remove distortion, while keeping the sub playing to it's full potential.
I've not had much experiance with newer Audiobahn equipment. I used to have a 1000 watt amp made by then about 5 years ago, and it was crap. I have noticed that a lot of retailers are stocking a lot of them now, though.
Someone above mentioned Rockford Fosgate. I absolutely love their electronics. I use an amp and stereo by them. For speakers, I tend to look at other companies.
Image Dynamics makes great sound quality subs. They might not put out the most volume, but they sound great. Cerwin Vega and JL are great if you are looking for lots of volume, but still want a clean sound.
I personally wouldn't have any regrets if I put a couple new JL 10w0's into my truck. I used to have three in there, and they were LOUD. I don't know what their current models are, so you'll have to do a bit of research. That would be my suggestion as to what to get, due to availability and price, for what you get.
This reminds me, I need to get my pair of Image Dynamics subs installed...