Now that I'm home, a few more details. This is the one I bought:
http://www.vizio.com.tw/product.aspx?pd ... D4F16A3862When I said it was sexy, I mean I was surprised that one of the things I'm most happy about with this TV is the way the 'box' looks - the 'frame' around the actual screen is really good on the eyes.
The USB is really useful. It supports not only Xvid/avi files, but also most H264/mkv stuff too which is the format most HD stuff comes in. This means that I can download the 720p versions of my favourite TV shows, transfer them to my USB stick and watch on TV very easily. I also watched the 1080p version of Planet Earth, which looked absofuckinglutely stunning. It won't support absolutely every format though - couldn't handle DTS audio, I think. If you're after that, go for a media box (WDTV etc) or laptop hook-up solution. But if you want something quick and easy, like me, the USB capability is a serious consideration when buying. Take a USB stick with you when shopping around and see which TVs support which formats.
Even without HD content, just my normal DVDs, hooked up to the player via HDMI cable, look shitloads better on this machine than on the old CRT. And you never know if you'll get a Blu-Ray or whatever source of HD content, so I honestly see no reason to not get Full HD 1080p capability. As far as measures of contrast go, I think someone else already pointed out that this is bullshit as there's no industry standard whatsoever.
Anyway, I'm very very happy with my 37" Vizio.