Staggered but leveled on 17s ?

[Mrbrown510]

Ok so my origonal idea was to do a 4/6 on 15s but the tire options suck so now im looking at staggered 17s .i want to run 17x8 5 inch backspace in front and 17x9.5 6 inch backspace in the back.i see most people run 255/50r17 in the front and 275/50r17 in the back.but that leaves the truck with some rake.would i have to go 4/7 to level it with those tire sizes?
Heres a pic to show you what i mean that rake

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[Donnie Smith]

So looking at some tires and the specs at TireRack.com it doesn't show much difference in diameter between the two sizes. 255/50/17 and 275/50/17 wasn't available so I looked up 255/40/17 and 275/40/17 in BF Goodrich and it shows a .6" diameter difference between the two sizes. Pretty negligible and could probably not notice the difference with the 4/6 drop. Just check diameter specs on the tires you buy to see how much difference there is and if more than an inch you might want to drop it further. Your choice.