Gday Mando - I bought the kumhos from tyre rack (ecsta SPT), as they were the largest diameter tyres 285\40 and 245\45 in 17's I could find at the time. the reviews were reasonably good and the price was right. I didnt notice 255\35 at the time, but do you realise that gives you a front tire diameter 30mm bigger then the rear? I dont know if that is bad or not, just through I would point it out.
Cheers