Need speaker advice

I am new so I hope no one thinks I am an idiot. Anyway I have been a technician at a Chevy dealer for about the last 10 yrs or so but I have never really delt in the aftermarket of Car Audio I have always been more concerned in going fast than sounding good. Anyway I helped out a local Sound Shop with a Remote Start they had installed in a 2005 Chevy Uplander a few months ago and he made me the offer of selling me a DVD/NAV kit for cost so I took him up on his offer and got him to order me a Kenwood KVT-815DVD and a KNA-DV4100 to go with it. I installed it last week end and I love it.  I ordered a Sirius Tuner for it so I can take out the Plug and Play unit I currently have.  And I have decided to go ahead and upgrade the speakers and such while I am at it. But I have no Idea where to start.  I am not really into that much Rap music so I am not looking for huge subs or base (not sure if I want subs at all) I am thinking of just replacing the stock speakers with some really good componet speakers and amping them out. But I don't know what to buy.  The main reason I am not really interested in Subs is space.  I have a 2000 Silverado and with the Nav Unit, Head Unit Tuner, Sat Tuner, and soon to be Amp and Crossover I don't think there will be space for a sub under the rear seats. So my question is what speakers to go with I have hear alot of good stuff about Memphis Audio but don't know what else is out there. And as far as an Amp what size would I go with I figure a 4 channel but don't have a clue on power output.  would I need a Crossover or Capaciter?? If so what recomendations would you suggest. Sorry for the long read. I will frequent the boards for a while and try to help as much as I can. I am sharp wen it come to electronics esp in GM stuff and Have access to wire diags. So if I can help let me know.

Thanks

Chris Wilson

Hey Chris, Ive got an 02 Silverado. I put an 8 inch kicker solobaric under the rear seat. I built the box myself. $20 bucks for a sheet of 3/4 MDF. There are also a couple companies that make boxes just for that truck. If you decide you want subs and would like more info on any of these options shoot me a pm. In the front doors I used a set of MB Quart 6 1/2 inch separates with a 1 inch tweeter. In the rear doors  I just used a set of 4x6 plate speakers. Clarion if I remember right. The whole thing sounds pretty good. I used a Kenwood 4 channel amp for the door speakers. I believe it's rated at 40x4. For the sub I used a Rockford Fosgate 401s I think.  I would say use good quality speakers making the front your priority. Then check the RMS power ratings and get an amp in your price and power range. I have the sub and both amps under the rear seat. There is more room under there than you think. You could even fit two subs under there. Here is a link for you to check  out.  http://www.crutchfield.com/S-QuPEpqSInY5/cgi-bin/ProdGroup.asp?g=530     If you need any help let me know I am pretty familiar with this truck.