So the new TV (an LG LS570T) is up and runing and looks fantastic. Having tried DLNA, it works OK but can never be as good as a dedicated frontend. For the time being I have wired up my old frontend/backend to the new TV. I have to say that the Myth interface in full HD looks amazing.
The TV has iPlayer and LoveFilm apps, which are better than running those feeds through Myth, and the HD channels on Freeview look stunning. But I will still use Myth for recordings and films.
The only thing missing is the ability to record HD in Myth. To be honest, I’m not too fussed about that so there’s no rush to upgrade. I have an Acer Revo in the study which would make a great HD capable frontend, but as it’s the only PC in the study and I use it for lots of other stuff, it will have to stay there for now.