As far as a sub+amp combo, I don't have a lot of experience with different brands and there are a lot of options.
I've got a 10" Alpine Type R DVC with an Alpine mono amp running 350W RMS and it sounds great. The 12" will emit a little more of that deep, overwhelming bass but the 10" keeps it tight & clean.
Here is what seems like a reasonable combo, but you might be able to find them separately cheaper:
http://www.premier-audio.com/ProductDet...111Type%20R%20Bass%20Pack%202&click=35
The F650 amp supposedly runs 600W RMS @ 2 Ohms, which is what you'd be running at since you'll bridge the sub down to 2 Ohms I'd imagine, and the Type R is only rated to handle 500W. Shouldn't be a huge problem in the long run, depending how high you like to crank it, but check with a car audio expert.
I personally like my 10" Type R and matching it with a 300-500W mono amp shouldn't be a problem.
Remember you need an enclosure for it and some decent wires too.