quesion on how this'll match up

Hok, so...I have a 2003 cav. I plan on getting Alpine SPS 460A and SPS 690A for my doors and rears. I have 1 12" Orion Cobalt sub or I could use 2 JL 12W4. Does this sound like it'd be a good system and which sub/s should I go with? Also, I currently have a Pioneer DEH 2300 headunit....it is a few years old and I want to upgrade to one that at least plays mp3's.....my dream would be to get something that is pretty much a hard drive that'd pretty much make me making cd's obsolete. Anyone have some info on a good/decently priced cd player that plays mp3's or something with a hard drive?