I would say you would be better off going with something chrome. I'm not
sure how durable teflon coated would be and I'm pretty sure polished would
not hold up to salt, snow in your area. I would also say that 17x8 inch wheels
would be fine with the size tires you want. Too wide a wheel exposes the bead of the wheels to curbs, etc. As opposed to narrower wheels that let the
tire sidewall take more impact.
You might try checking with some tire shops in your area to get some more info on the wheel coatings. If you buy your tires/rims from the local shop, you might check with them and see if they will mount/dismount on two different size wheels. That way, you get an idea of how it will look.
Hope this helps.
It would probably be hard to tell, but I have 16x8's on my rig w/265/70R16's
or, you can check out the pics in my gallery.