If you want the best enclosures, use Hoffman boxes. Sold by Grainger and Allied electronics here in America. Very expensive but I primarily buy them used from ebay. Way, Way Way cheaper. Hoffman boxes are used primarily by Industrial facilities and municipalities. I work at a municipality and we use 100% Hoffman enclosures as they are nema 4 rated. No cheap plastic is ever used. 100% very rugged steel. I wouldn't and don't use anything but Hoffman boxes. The big negative is that they are HEAVY and when loaded with numerous power supplies, it takes two men to lift, but they will protect your electronics to the nth degree. --Greg--
http://www.pentairprotect.com/hoffman