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It would be better to deal with the understeer via a thicker rear anti-roll bar than increasing the front tire width. Changing tire widths can have undesired consequences on the handling character of a car, and usually manufacturers spend a great deal of time and money researching and testing the tire sizes, make, and model to get just the handling they want. That's not to say that if you really know what you're doing (most don't), you can't make tire changes to tweak the handling to your requirements, but for most people, a thicker rear anti-roll bar is the better route than messing with front tire widths.
Having said that, I would likely get another set of wheels for winter/summer use, but I like the OEM 5-spokes so much that I would probably find some cheaper wheels for winter rather than spend big bucks making modest improvements for summer.
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