With coilovers you can run a 17x8 +35 F and a 17x9 +35 R without rolling the fenders unless you're doing some SERIOUS track duty with R-comps. Trust me on this.
The size tire you have listed for the rear, while it will work, isn't ideal for that rim size. 9" is good for a 255 tire.
A 10mm spacer is WAY too much in my opinion. You'll need longer wheel studs, new lugs etc etc etc.
From the specs above, you can play around with different sizes/offsets by using a calculator like this one
http://www.rimsntires.com/specs.jsp
Or you can go baller........ 
Enkei RPF1 in an 18x8.5 +30 and 18x10 +38 with a 255/35 and a 275/35. Use lots of inflation though and hope they don't flex. You MAY rub in the rear, I did slightly with the Hoosier R6's on the trailing arm and the exhaust shield, BUT, they were about 5lbs under inflated, they never really got hot enough, the fronts did though 
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