I'm surprised more people aren't going with x10's all the way around. You get the concave look both front and back and get better handling and of course can rotate if using the same tires. I considered getting the 11's out back but decided I don't need a HUGE tire back there. 275 to 295 looks beefy enough in my opinion and remember the bigger you go the more rotational weight you add. The whole reason I went to Forgestar was for 2 reasons: 1) The light weight, and 2) the concaveness of the wheel.
Also note those who want 20's, the 20x11's for some reason are not deep concave, and their regular "semi concave" are nearly flat-faced. Here's the chart:
SEMI CONCAVE
18"
18×8.5 offsets from +26 to +50
18×9.0 offsets from +20 to +55
18×9.5 offsets from +26 to +60
19"
19x8.5 offsets from +26 to +48
19x9.0 offsets from +20 to +55
20"
20×8.5 offsets from +26 to +50
20×9.0 offsets from +18 to +56
20×10 offsets from +31 to +69
20×11 offsets from +48 to +81
22"
22x8.5 offsets from +12 to +51
22x9.0 offsets from +18 to +57
22x10 offsets from +31 to 70
DEEP CONCAVE
18"
18×10 offsets from +16 to +42
18×11 offsets from +23 to +55
18×12 offsets from +36 to +68
19"
19x9.5 offsets from +4 to +42
19x10 offsets from +20 to +44
19x11 offsets from +23 to +55
19x12 offsets from +36 to +68
20"
20×9.5 offsets from +7 to +43
20×10.5 offsets from +20 to +55
20×12 offsets from +39 to +75
22"
22x10.5 offsets from +10 to +49
22x12 offsets from +29 to +68
I think the deep concave look on all 4 would be the way to go. What I really wished would work is sticking the Vossen CV3 10.5 on all 4. I have seen this on a couple of cars (Audi, MB) and it looks amazing IMO. I know you can make a 10 inch wheel work but think a 10.5 is out of the question. I sent an message to Vossen to see if there is any chance.