32" if far more common than 34"
Contrast ratio is all but useless as a measurement since there is no standard and every manufacturer tests their own sets differently, sometimes even different sets of their own differently.
Sharp Aquos sets are beautiful. I'd dig a touch deeper into the one I linked, as it's not the same line as mine, but Aquos = happy across the board as far as I've seen, and that's a great price on one.
Odd brands are hit and miss, usually miss with some exceptions like Westinghouse.
Good luck!