If you've got the space and want a slightly bigger TV then one of Tesco's 24" Technika HD LCD sets runs off 12V or mains, has a Freeview decoder, a PC input and a built in DVD player, which only seems to power up when needed. Half the price of dedicated boat 12V telly's as far as I can see and works a treat. We only use it for watching movies with the kids but it's an excellent bit of kit for a couple if hundred quid. Tesco's staff didn't even realise it was 12V so yes you need to have a look at the inputs yourself, not all of their models support this.
