The higher the contrast, the better. So, 1:10,000 is really really good, but you pay more for it. It's the ratio between black and white, basically.
I'd go with Samsung. But, do post a link to the one you're looking at.
This is pretty close to the one I was looking at but, I don't remember which store I was browsing could've been Best Buy or Amazon. A slight difference I might go bigger and get the built in DVD.