I've never heard of one with a 25.5" barrel. They come in 26", 28" and 30" lengths. I like the original 1100s better than the newer G3 myself. The dimensions of the old seem to fit me better but the new G3 works fine, I just don't shoot it as well as the original.
I see the older ones used around here for anywhere from $275 to $350 depending on condition and how they are set up. You should be able to get one in that price range I'd think.