I just got an XVT47SV from Tiger as a refurb for $650 shipped.
I can say a couple of things. First, the PQ is outstanding. Deep blacks, excellent uniformity, no visible defects of any kind, calibrates to near perfection across the board. As good as any consumer display I've ever seen.
Second, there is currently only one source of actual data for reliability of TV brands, and that's Consumer Reports. In their reliability survey of TVs purchased between 2007 and 2011, 4% of Visios have had serious problems. Most mainstream brands were beween 2% (Panasonic) and 5% (Samsung), with the worst at 10% (Mitsubishi).
Draw your own conclusions.