i went with the pioneer DEH-6400,it plays mini movies (like an indy car racing on a track) its got a remote, subwoofer control, 2 sets of pre-outs, and a 50x4 watt output. cost me $270, and i love it, not one problem with it.
Speaker wise, dont put another set of 4x6's in. just get some 6" rounds and make some plywood plates in. (i also did this)
But name brand wise: get something reasonably well known. Look for good rubber surrounds, sturdy cones, plastic or better, cardboard ones suck.
just look at guys signatures, and that can influence your brand