yeah there are many good door speakers you can choose from. focal, jl, kicker, rainbow and many other brands make good ones but a lot of people are content with pioneers, kenwoods, and stuff like that also. i would get a separate amp for the door speakers. there isnt an amp that i know of that will do 3000 watts to one channel, then 50 watts to the other 4. the L7s should be at 750 watts a piece at least. 1500 a piece is a good way to go but you have to get a good amp and tune your amp also.