i personally use a 37inch HDTV but have played on a PS3 at my mates on an SD tv and still looks good. Even blu ray films still look good!
feel free to ad me as your first PSN friend mate : bedhead1
defo pick up :
Uncharted 2
LittleBigPlanet
and Killzone 2, won multiplayer of the year over MW2...its very good and addictive lol.