The Epson 5020 does have similar lens shift, but I would be hard pressed to recommend any projector anymore at a screen size of just 80". If you have an available budget of $3,000, then you are close to the purchase price of a 80" Sharp LCD display. No more windows to worry about at all... in fact, none of the pitfalls of front projection to deal with.
Still, the 5020 is a very good model. Not sure I would upgrade over the 1080UB which is a rock solid model already.
If I were to buy a projector today, it would be the JVC RS46 - right about $3,000.