The Fearn's also look interesting - albeit pricey for two channels.
Lynn posted some audio examples of the GR and Fearn on the same material, over at 3DAudio.
http://www.3daudioinc.com/3db/showthread.php?t=3460
I think they illustrate the differences between the two machines pretty well - considering they're just MP3's. If you like that tube 'thickness', I'm sure you'll love the Fearns. I suspect I'll go for the GR first, and then consider the Fearns or MP once the bank has recovered.
Interesting to hear your comments on the MP. Most seem to like it for mids and highs, but not for bass. I often need to tweak the bottom end in the mix so the MP may not be the one. Trying not to pre-judge though - invariably you form preconceptions on these things based on other people's opinions, then get them in your own studio and find the complete opposite!
I'll let you know my personal 2pence as soon as I've got things set up.
Jules