Need a push in the right direction.

First of all great site.  Lots of useful information.

Now...  First off, I am realtivly new to Car Audio.  I have recently purchased a 05 Chevy Colorado and I am looking for some advice/input on some speaker/amp/subwoofer combos.

It is a crew cab truck with next to none space in the rear of the truck for subs.  I can fit 2 amps (one on each side) behind the rear seats with about 3" of space.  Under the rear seat I have about .5 cft worth of space.  Around 4 1/2" for mounting space.  I am also considering raising the rear seat another 1/2" to 1".

The Front doors have space for 6 1/2" component and 1" tweeter.  The rear doors have 6 1/2" holes.

I dont compete, doesnt have to knock my fillings out of my teeth just nice SQ with solid and smooth bass.  I listen to a varity of music, pop, r&b, classic rock etc. I also like matching items, brands etc.  What can I get the best bass for my buck?

What front seprates and rear coax can you guys recomend moderate price around $300 for both combined.  Also what amp would be best matched?  aournd $250.

For the rear subs.  I can only fit a single 10 unless there are some that can use .25cft each.  then I can use 2.  I will even consider 8's.  Looking for around $150 a sub and a solid amp for the aourn 250 as well.

Any information will be great.  Sorry for the long post.  Thanks