Aftermarket Amplifier

[md_sailor]

Alright Guys, I've done a thread search for Amp's and was hoping for more specific information. I have a 2003 Lux that I have installed the 2005 touch nav and XM radio with the USASpec 6 disc changer. I would like input on how to ad an aftermarket amplifier. I may also upgrade the existing speakers. I am not intrested in changing the appearance of the system or speakers and would prefer to have aftermarket speakers that swap out with the OEM Bose units. Does anyone have input or pics of installations to share? I would not mind a Sub but dont want to loose cargo area. In my opinion an added amp and quality speakers should provide enough base response to suit me. I look forward to your help. You guys rock!