205/50/16s - you'll have the widest choices of tire (I think, if not
close to it) in terms of brands. Also closest to OEM specs, so your
speedo won't be off.
215/45/16 will be a tad wider and more low profile, but your speedo
will be off and there's not as many choices.
225/whatever is probably only in play if you have a 7.5" wheel or
you have a good tire mounting shop nearby, heh.
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