ok, i have been looking at the Alpine CDA-9830 and the Alpine CDA-9827. I like the look of the 27 because i am not sure if i like the green buttons on then 30, but the blue buttons complement my car. PLus the 30 has the 4 eq bands and i think that would definately be a plus. I also plan on getting subs and other speakers, so i think the bass engine plus would be a lot better. I dont know, i'll gladly take suggestions. Thanks