for that sort of money your only going to be buying the old stuff from the decent brands or your going to be cheaping crap.
you would be much better to save a bit more and get yourself a better set.
the best plasmas are the pioneers, but are going to be well out of your price range. The next best plasmas are panasonics, and as stated the 42" is only just out of your price range.
The old LX60 series was plagued with problems so best avoided. Seriously, save up a bit longer for the newer 70 series. Or at worst, settle for the 37inch. Unless you've got a big room, you'll find the 37inch perfectly big enough.
as for LCDs. None of the current 40 or 42 models will be found in this price tag. If your going samsung, your only going to be getting the older 7 series. Most of which are HDMI 1.0 and most models only have the 1. The newer 8 series sports 3 x HDMI 1.3 sockets. The R8 series isnt even the 1080P series either So its old entry level stuff, not even old top level stuff.
Same goes with phillips (they're best 40" LCDs are like £1800 or something daft, they're a pricey brand), your only going to be buying old entry level stuff for this sort of money.
Same goes with the Toshiba's. You're going to be buying a WLT66 for that sort of money. The current (and about to be replaced) WLT 68 is out of your price bracket.
Seriously, either save some more, or compromise on size.