I just went out and picked up the Kimpex and installed it in 10 minutes. I do like both the Warn and Kimpex but I think the Kimpex will overall offer more protection plus the dealer never had the Warn in stock.
I have the warn bumper on my 05 rinny. It think the warn uses thicker steel than the others. It is really strong. I have pushed trees over w/ it and many 4-wheelers out of mudholes w/ it and w/ no damage. The warn also fits more flush and looks better. go w/ warn.