Tiesto Event are in my opion the 2 best. There is also a other person but i cant remmember their name. Theres alot of designers good with different things. But when it comes to sigs these 2 are my fav+
meh, Irell, Blacklabelwood, Savage , Virtuosity, DNA, 8thWonder, Glory, Slickilla, Korpus, the list goes on and on..