I'll second what descartes said. I don't think I've ever heard a cyclist disappointed by the Giant Rainier. Giant also makes a disc version of their Iguana for $500-600, although the LBS I talked to admitted that the specs aren't as good as the regular Iguana. There is a problem on their website today, so I couldn't compare them myself.
Also, I wouldn't be too quick to discredit the virtues of V-brakes unless you plan on hilly terrain and aggressive riding.
The other bikes you are looking at seem decent as well, although the Judy TT is Rockshox base line fork. It is heavier and not as smooth as others, but is stiff enough for a lightweight like me.