After comparing lots of different sets now with the guys at work we've decided that anything about 37" you have to go Plasma still. So I'd go Plasma for 42". I did and I don't regret it one bit. 1080p makes next to no difference at that size but does add a fair bit to the cost.
My boss just got a 50" 1080p. Being 1080p is a lot more beneficial on a set of that size, but not really worth the extra outlay on anything smaller.
People will spout 1080p till they are blue in the face but if you spend a lot of time looking at screens in a normal environment I.E. not standing an inch from it, then it makes no difference at all.
I bought this one:
http://www.play.com/Electronics/Ele...eview-Plasma-TV/Product.html?searchtype=genre
As did lots of others on here. Everytime I watch something in HD I'm amazed by how impressive it looks. They've dropped in price even more since I bought mine!