Hey stemwad, welcome to the forum. I would definitely stay away from the FOREST RIVER product (see Forest River Issues, General RVing). The other 2 are about a toss up. Hopefully you will get some feed back from other forum members that own the other brands.
No Doubt ForestRiver has issues (with their TT and 5th wheels, some class cs,. but the Lexington model is built elsewhere and it blows away anything else iv seen in that line up, Im talking they use the top of the line vendors for everything on the Lexington. Thats the loaded Lexington GLX or GLS model. very nice.