I don't know much about the R&Ps on the market, but you should be able to alter the front end geometry a bit to get better turning radius. Sinply drill some holes in the spindle arm closer to the spindle(basically you're relocating the tie rod ends slightly).
This should turn the front wheels more and thus decrease turning radius.
Ever consider a differential?
EDIT - Oh yeah, I was reading up about Buggy Depot, and I found out that Travis actually has an account on here.
Only ever posted about 3 times in response to Joe's complaint, and hasn't posted since.
If you look it up you'll see some more long-winded excuses!