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Just a bit of info for anyone looking for that extra clearance from putting bigger wheels on.
My cousin is running grand vitara 16" steels with 205/80/16 insa turbo special tracks and these measure 29" total diameter.
I've just fitted 235/75/15 malatesta kaimen's (special track pattern) to my 7 x 15 modula's and these measure 29" total diameter.
I looked for a while to get a set of grand vitara steels but for the money the pull on ebay I was a bit reluctant to fork out over £100 for 4 rusting steel wheels.
So I changed from 235/75/15 maxxis trepadors to these and even though they're the same size they stand over 1" taller.
So just another option to get the same clearance.
This is part of my wheel tyres dilemma as I want the kaiman/special track tread pattern but no arch mods and no smaller than my 205/80/16 kl71s so I'm thinking of abandoning the 16" idea and going for 215/80/15 kaimans.
It's only malatesta and fedima that do this pattern in this size and fedima are £20 more expensive each so I'm thinking kaimans.
You're right about the vit wheels. You can get a nice set of modulars for £125 delivered. Do a wheel tyre deal and it gets cheaper!
If your going for mega big I think 16's are handier. The vit wheels don't keep themselves clean easily though as they only have small drain holes around the time and their design clogs and holds mud more for some reason.
Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
i got a set of GV 16's for £46 of ebay, so dont give up they can be found for sensible money (without tyres, which you wouldnt want anyway) and they were in good/very good nick.
iv just put nokian wrg2 suv's on them was round at a friends and from standing starts in the snow with foot fully down it refuses to spin just zooms off, traction is immence. only quible is that in 2wd on sheet ice she gets a little tail twitchey.
I did get a nice conditioned set of 4 GV wheels for £60.00 off difflock so as has been said - if you persevere they are out there - but most people do want silly money.
Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
with diamond back remoulds, they are closer to 31" tall !! 
