Another 20" Wheel Question

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I know this has been discussed but...

Getting ready to pull the trigger on some 20's and need to ask you guys a few questions..
Was gona run staggered 20x10 5.50bs on rear and 20x8.5 5.00bs on front.
Does this sound right?
Can I run a 20x10 7.200bs on the front? It would be about the same on the outside (fender lip) so the extra 1.5 would be on the inside. Would that work? Has anyone used a 10 wide wheel on the front?

Tire size I am considering a 245/45-20 front and 275/40-20 rear both are 28.7 inches tall and the rears are 1 inch wider than the fronts. Is this too tall?
The other tires I looked at are 245/40-20 & 275/35-20 which are 27.7
Price is about the same so that's not an issue.
Any help would be cool
Thanks