I sell LG, Samsung and Toshiba's at my work, and used to sell Sony and Panasonic at an old job, and what I've found as a very general observation -
LG are my favourite out of the brands, got myself a 26LU5000 about 9 months ago and I love it. For a 37" you can't go far wrong with the 37LE5900 (recently bought this model for my lounge actually), it's a fairly new model, Full HD Edge LED, 100Hz, also it's got Freeview HD so if you don't have Sky HD or anything like that, you can still make the most of the 1080p with general TV watching. Pretty sure the only models above it are the 3D ones but I might be wrong. We sell em for £649.99 but bear in mind we're VAT-less in Guernsey. My PS3 looks sexual through it =P
But yeah, you can also get that model in a 32" (32LE5900), not sure what kinda price but I'd estimate around the £530 mark.
Samsungs are good, better design than LG no doubt, but I find their menu system less intuitive and you pay a bit more for the nicer design, personally I don't care too much about the shape of the stand or whatever (alot of Samsung's have this chrome spider stand now rather than the plastic/glass block stand that you get on other TV's e.g. LG's), I'd rather spend the extra money on getting a higher spec TV than a nicer design. Only thing is, if you're wall-mounting, Samsung are pretty smart with their LEDs in that they have all the HDMI's on the side rather than facing the back, and the SCARTs and Coax plugs are done with extensions rather than straight onto the back, so you can have it flush to the wall. The equivalent to LG's 32LE5900 would probably be:
http://www.amazon.co.uk/Samsung-UE32C65 ... 669&sr=1-1We've had 'em in the shop before and they are stunning TV's, but a bit overpriced for what they are IMO.
Finally, Tosh I wouldn't touch these days, they're decent enough I guess but all of the LCD Toshiba's I've seen lately have terrible viewing angles, and horrible design, haven't seen much of their LED range mind.
Sony and Pana were both good when I last saw them but you're gonna be paying a bit more for similar specs to the LG/Samsung specs, I reckon. Don't know much about their current ranges though.
Finally, the speakers in all of the LED models that I've seen are pretty shocking to be fair (although you can probably understand that being that it's a TV around 3-4CM in thickness at the most, and they're putting speakers in that will fit that design ;p) so if you go LED you're probably gonna want a home cinema system or something for serious movie watching or anything, however they're decent enough for just TV and stuff.