C5's are a great speaker hands down, nice mid bass and a smooth silk tweeter. for the price i haven't heard much speakers that sound better, unless some one has a ton of money tied up into other things, like amps, sound dampening, processors, etc... zr's are also a great speaker, however zr have a metal tweeter making them more harsh and a touch brighter. this is not necessarily a bad thing just depends on what you listen to and how you listen to it. also you mention you need a 5x7 comp. I would recommend getting 6 1/2 and having a stereo shop make you some plates so 6 1/2 fit perfectly. also take a look at the jl audio c3 they sound very similar to a c5 set and cost a bit less. ( all this is based of my own experience and is strictly opinion ). Others will recommend there preference in brand and model, but also take into consideration the jl speakers all sound great out of the box. a decent amp and some sound dampening on the door is recommended....