I've been fighting the same question, i'm looking at the same set as well. I like the stance of the staggered setup, it looks fantastic, plus it would give some added function to the rear by giving more grip since there is more rubber to meet the road. The standard setup is nice because you could rotate the tires... keep in mind though, if you have directional performance tires, as many of them are, you can only rotate front to back, and not side to side. I'm going to end up with the staggered setup, I just know I will... it'll look best and be what I want in the end. It'll cost more, yes, but it'll be right.
2011 Grabber Blue GT California Special, 3.73 Gears, 6-Speed Manual, Steeda CAI, Steeda 93 tune, aluminum driveshaft (The Driveshaft Shop Co.), MGW shifter, Roush axle-back exhaust, Roush Side Rocker Panel Splitters, Ford Racing BOSS 302 front splitter, sound-tube delete, painted plug covers, JLT oil separator. Shelby transmission scoop & powder-coated trunk brace & many more items...