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Since you're keeping your 17's for tracking, a 1 inch difference between front and back shouldn't throw off your balance (that you'll notice anyway) on the street. You'll probably notice more of a difference if the widths are staggered as well (wider rears = less oversteer), but again on the street it shouldn't make any difference unless you're driving like a maniac around the neighborhood.
My biggest nitpick would be the size difference in the wells (unless you're making your overall diameter roughly the same by using taller tires on the front).
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