The DXG remains my favorite for serious reading. The dimension is similar to a HB book and the proportionate default font is outstanding, IMHO. I also have a Touch and Fire. I very much disagree with the previous poster that the DXG is "too large" or "too heavy." The DXG is very thin and not heavy at all -- I travel with it routinely. In fact, I like it so much I bought a backup during Amazon's sale, with some points applied, for $130.
My only disappointment is the lack of support (updates).