I really appreciate all the replies. I have now decided to go with a 10" for the reasons mentioned (good value & suits what I want). I was thinking a Rockford Fosgate Punch Stage 1 subwoofer (150 RMS) paired with a Fosgate 150 rms amp. That would only be $70 (sub) + $100 (amp) excluding the box and wiring. I already installed an aftermarket head unit a while ago so I'm good there. I don't want to be narrow minded with brand of the sub though, if anyone has any suggestions on that I'd be glad to hear them. JL is not out of the question but going that route would definately cost more. Also I forgot to mention, definately going with a sealed box.
I was in Auto Audio today with a friend geting terminal cups for his box and it's a pretty nice environment. I'll probably pop into MCOR some time this week to check it out since it's fairly close to where I live.