You've got it right. Now the only question is if that 28-135 is wide enough for what you want to do with it, and really only you can answer that. Personally I'm a big fan of wide angle lenses, and my 28-80 just doesn't do it. I'll have to add a 12-24 to get the angle of view I want to get back into (which was the 20mm range with 35mm).