The quality on some are MUCH better then others.
1st, I've heard that some TV's with SVid just have a SVid -> Composite converter inside.
But if you are going to try a TV, make sure there is a return policy. So go to a store like best buy where the people in the return department don't care if you return something or not.
Or if you go to a smaller local store. Ask if you can bring a computer in and test it. (some will)
Nothing like getting it home, installed, remove the cover and warranty... and find that it sucks