This has been a topic in other threads and everyone has their own opinion.
Vote based on which brand has the best: sound quality, durability, cost vs. quality, functionality, add-on compatiblity (iPod, Navigation, HD radio, etc...), and any other features you can think of.

or just pick the one you think is prettiest.

 

I couldnt say which is the best but Id have to say I havent been disapointed with the quality the Kenwood Excellon HU put out vs others at the same price though I know Pioneer and Alpine also make great high end ones.

 

Pioneer Premier - nuff said.