I'm coming in late on this thread but have a little info and experience. 2-3 yrs ago I bought a 15" Panasonic LCD for about $175. It runs on a 15vDC IP that is 60W powered by 100/110/120vAC source.
It is our soon to be obsolete tv standard, but this was 3 yrs ago and cheap enough if I ruined it. I paid $14 for a full warranty beyond Panasonc's for two reasons. One, it extended the warrenty and specifically added covered damage from water and humidity, and other thangs that are of little concern to those in dirt dwellings, but quite plausible on a boat. It had all the inputs, component, S-Vid, composite, DA. I powered it by plugging it into a little cig lighter AC convertor I bought for maybe $15. Worked great. I then got a little $28 DVD player that uses all of 1 amp, plays all formats (except HD), has component vid and DA out. It plugs into that same little gray cig lighter invertor (2 sockets) and works fine. No complaints.
This year I bought a 19" HDTV with the ATSC (digital) tuner. It wants to see a little more power, 70W and is AC only. It runs on the same little invertor. I have a bigger 800W invertor I could use, but this little one does a fine job, rated at 70W nominal, 100W max, amd 140W surge.
And for those of you who don't have these new ATSC (HD) TV's, you are missing a lot. Most stations are already, have been for awhile, broadcasting digital channels for a long time now. Major stations b'cast multiple digital channels.You may find your PBS station is now 4 digital channels, local network affiliate may have a full screen regional doppler
radar 24/7, etc.
And turning off analog may come sooner then Feb '09 in some markets. There is a provision in the ruling that allows a community to do the switch earlier if all the stations in the reception area have already been doing digital transmission and have shaken out their issues. Wilmington, NC is being spoken of as possibley switching off analog this September.