"That said, I'd love to have a couple of 32" 2560 x 1600 displays for my desktop, but I think that is still a couple of years off from being 'mainstream'"
Overclockers have a sale on 27" 2560x1440 displays today. They're selling for £311. I bought one about a year ago for £450 - worth every penny.
http://www.overclockers.co.uk/showproduct.php?prodid=MO-019-...
That's not a high-DPI/retina display though, just a regular DPI.