I am looking at the one from Summit and 90% sure I am going to pull the trigger on it. The other one you listed was Canadian and list the Hertz as 50, which really shouldn't be a factor in transformers (considering they only focus on voltage) but it still concerns me a little
(and 240 and 277 are WAY different. in the US, 240 is 2 lines, 120 and 277 is one leg of 480 to neutral.
Goof find. THANK YOU VERY MUCH