Hi,
I'm looking to do the same thing.
My research tells me that LCD is the way to go due to low level of light refection. But then again I've recently noticed the price level of Plazma tv's plumiting and then there's the worry of it getting it stolen outside so you don't want to spend too much (well for me anyhow) I'd be interested in how you're going with the whole idea?
Oh another hint from a TV tech. If you're having trouble with signal loss, try using "Cat 5" computer cable for your AV leads, if you're handy you can make some up yourself!
cheers
Brucemichael