i like mb-quarts or boston acoustics for mobile audio stuff. The focals are nice, haven't had any experience with them but have heard them at the shop and they are alright.
Amps, im kinda retarded so i like to match all of my stuff, so, i try to keep my subs/speakers/amps all from the same brand. THis way of think has brought me alot of headaches but heh, we all ahve our ticks!!
head units, i really like this one without nav
http://www.pioneerelectronics.com/pn...671418,00.html
but since you said nav........ " now where is that card... hmm...oh..... BAMMM!!!!!"
http://www.pioneerelectronics.com/pn...unit=AVIC%20Z1
avic-Z1 7" screen, pioneer nav , bluetooth.. this is what im going for.
for subs, well, Jl's are nice, mb-quarts subs are sweet and the bostons are also good. There is kicker which is very common, i like the MTX high end series, (9000 i thnk) a bit better though.
how are you gonna place your subs?