When you said "installation", I assume you are going to auto stereo shop and let them do it for you. You should tell them what you want, and let them recommend you. I think you should try to stay with the big names such as Kicker, Rockford Fosgate. Also shop around and see the prices.
Before I changed my head unit, I only have a Kicker DX500.1 amp, and 2x 10" Rockford P2 subwoofers enclosure in my trunk. It gives me pretty good bass(heavy enough to shake my rear view mirror).