Ok, from all this reading, here is what I have come up with (and please correct me if I am wrong.) Small things that I shouldn't worry about are things like FF vs. TP insulation and circ pump vs. no circ. pump. Big things to make sure I worry about include reputable dealer, warrenty of brand, price (of course), and most important, results of wet test. Am I missing anthing as far as small things that I shouldn't worry about or big things that I should?