Not sure what the up-grade model is. I would stay away with any water sensing and lid lock. I would go for the 2800 series.
I am one of the few that is a fan of Lowes, free delivery, set up and remove old unit. I had them put the old unit on my truck.
Who takes care of it for 10 years? I would definately want someone to waranty it for 10 years.
Hope you like it.