So you're thinking of a plasma or LCD, and you're thinking of 42''? or 47'' - but not 50''. Let me assure you... once you get a 50'' screen, you'll be pleased you did.
The LG 50PK590 is a mid range plasma which has Netcast, and media player function. when i put it in the room, my initial thought was ''its too big'' - my missus said '' thats not staying'' - but 6 weeks on, she loves it, and its been a great boon for watching movies and sport in HD of course.
The media player function works fine, so it plays most media files avi, mp4, mkv generally whatever the size - the odd problem with audio not working, but this just means you have to acquire another version.
Netcast has BBC iplayer and a few other things, and i have it connected to my internet via LAN cable.
All I wanted to do was dip my feet into the plasma market, and give it a go. The TV was £350, so for the money it was worth a crack, and the picture is superb. I had been toying with a 1200 samsung or panny 3D, but now glad i didnt - maybe in three years time....