Sounds good Al,
I've often thought it would be nice if the 315/35/17 tyres on the back of mine filled up the guards a bit more. Plenty of width there but a bit more height would be good.
Stiffy,
Check out
www.tirerack.com and punch in the sizes you're after. this will give you a good starting point of what's available in the US and then you can see what you can get locally from there.
Cheers