Hot Water Tank Hook Up

here is what im looking at

http://www.lowes.com/lowes/lkn?action=productDetail&productId=183994-135-SG1J4040T3NOV&lpage=none

http://www.lowes.com/lowes/lkn?action=productDetail&productId=171269-135-SG1J5040T3NOV&lpage=none

http://www.lowes.com/lowes/lkn?action=productDetail&productId=219112-135-BFG2J5040T3NOV&lpage=none

cheepest i can find… $452 and in stock …
http://www.lowes.com/lowes/lkn?action=productDetail&productId=89263-135-BFG2F5040T3NOV&lpage=none