Stock is 205/50 x 17; I'm running 215/50 x 17. Any negative to going one size larger? I can't see any rubbing inside the wheel wells or on suspension components.

 

If you don't hit anything from lock to lock or with the suspension bottoming out there's no real issues. Though winter handling and hydroplaning become a larger problem.
One other thing is you can't go much wider than the rims cause there is more stress on the tires that cause wear patterns in the tread. Some of that can be prevented with tire pressure modification - to result in even pressure across the tire. One way to test even pressure is to spraypaint the tire, though I never had luck with that.
This should be aleviated if you get a wider set of rims, then you have to be careful with all the offsets and such that you keep the tire centered over the bearings, and still not hit anything when turning / full suspension travel.