Well I went ahead with the 255/70R16 Revos and I'm very happy with them so far. I do go off-road occasionally, mostly when I'm camping/hunting/fishing/etc.
My budget was pretty tight, and the 255/70R16 were a bit cheaper than the 275/70R16. Maybe once I wear these out I will move up to an even larger tire...
Meanwhile, the Revos handle great so far and look MUCH better than those stupid Grabbers.