Once you get 16s there are a few good options out there.
I ran the Geolander ATs on a Jeep I used to have - they were good all around tires on trails - not so great on snow.
The BFG ATs come in 215/70 r16 and some have run this size on their Foz successfully while others reported some rubbing issues - this size seems to be just at the edge of possible. Good tire though...a bit pricy.
I just loaded up a set of 215/65/r16 General Grabber AT2s onto my SG. I had to order em online from Wal Mart. Don't usually buy anything from WM but it was cheaper there than Tire Rack b/c they offer a free ship to store option. Pretty good tires so far though. Look good, not too loud, pretty aggressive tread, no rubbing Issues at all. Only potential downside I see is that the sidewalls seem a bit soft - time will tell. Here's a pic or two.
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