Dollar for Dollar...you're going to be hard-pressed to find better quality than Vizio.
But yeah, like everyone else said... go to Wal-Mart and buy good quality for much less than you can buy in an RV store. My trouble is that the old set in my coach is a heavy 26' square tube-type, analog mounted in the dash. No replacement is going back in that hole so it'll become a cabinet of some sort and the new 42" Vizio (much lighter, and better quality) will have to find a new home. Got the TV...just haven't come up with the solution for placement yet. I've had the coach for 3 years now and have watched TV once...not a HUGE priority for me. ;-)