Tire question..?

I have a 2007 GT Its got stock tires 235/50/18 now i wanna go wider in the rear.. Anyone got any input. The car is at stock height, dont want it to look to gay with a thin side walled tire thinkin like a 255/ 45 or a 245/50. i plan on buying all 4 new tires so i dont wanna run two different heighted tires.
 
I ran the 255/45-18 up front on an 8.5" wheel (same as factory) and really liked the look.
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I'm going to get 265/40/18 Mickey Thompson drag radials on my stock wheels in the near future.
They are smaller than the stock 235/50-18!!!!! I have those MTs and run them with the stock tires up front. I was actually disappointed they weren't wider:nonono: The sidewall is exactly even with the wheel lip (no bulge like the stock tire) and they're about .5" shorter, which is VERY noticeable!
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