The problem with the 15'* is that they are hard to find. I found a set of 14'* online, and I've found 16'* online. I want the stock look of diamond spokes, but I feel like the 16'* would still look stock, but would look a little nicer, and in case I ever need to replace one, I think they'd be easier to find.
I don't think ride quality will be that big of a concern, I just wanted to make sure that I wasn't overlooking some obvious problem that would crop up when switching from 14x6 to a 16x7. I won't be buying them until this weekend at the earliest, so if anyone sees a flaw in my plan (buying 16x7 rims and putting 215/60-16 tires on them in place of the 205/75-14 tires currently on the 14x6 steel rims), I'd appreciate a heads up.
If no one sees any flaws, aside from some slight reduced ride quality, I'll post pictures once I get the new tires put on the car.