Without major power loss or IFS components: 31's. But its going to be even that much faster on 215's.
What can you fit without a lift and some mild hacking/hammering the firewall: 35's.
Snowtoy, the thing you didn't take into account in your power loss % is weight. You only took into account the reduction in gearing from the larger tires.
I'd take 215's and 4.10's over 35's and 5.29's any-day for driving on the road. My toyota is SLOW!
