I've got a 2012 iGT coming in a few days with the ugly ass 16's. I currently have a 2010 sGT and the dealer said i could keep the current sGT wheels as long as i let him keep the iGT's. The real problem is the tires (kuhmo Ecsta LX Platinum) on the sGT are about a year old. Do you guys think i should keep the 16's on the 2012 and just get new wheels come spring or trade them out??
The stock 16" tires dont handle nearly as good but I doubt that's what your wife will be looking for. They're Bridgstone EL400's or something like that and you can expect to at least get quite a few more miles out of them as opposed to the 17" Yokohamas. They'll also ride a little bit better due to the less aggressive tire (softer sidewall) and the fact that they're a 16" vs a 17".
I will say this though. I think the new 16" wheels are pretty ugly... The 17's look much better in my opinion.