What do you guys think?

When I went from 3.91 to 4.30 I only picked up a .10 in the 1/4 and .05 at 60ft (I run 11.30's at 120). Since yours is a street car I would stay with the 3.21 it's not worth the extra wear and tear on everything for a .10 or two. This is unless you are doing heads up racing and need every little bit. You may get more seat of the pants feel with lower gears but it won't be much quicker.