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+15 is gonna be too aggressive with your setup. Go for the 35/40 and get spacers. I have some 10 and 15mm slip on hub-centric spacers, you just have to buy the extended studs (i'll sell the spacers for cheap)
i feel nervous about spacers, just seen some not so great things..
As long as they're installed correctly (ie: by ME! lol) you'll be fine. I've had my spacers on for thousands of miles and i used to abuse my car before and no problems.