>currently have nitto 555 235/45/17 and they are fine. I know
>other dsm'rs out there have 205/40/17, so what do you guys
>think?

Check this story...

I've had 205/40/17s on for over 4 years & the only problem I had was that one went flat & I was still riding around on it un-noticed for about 10 miles. I got 4 nials in it and pretty much lost all tire pressure but did not notice until trying to bang a corner @ about 40mph. The turn was made but with some tire squeel and squish feeling. So I pull over & say SHIT I got a flat. I goto Discount, its just an easy place to go and do buisness with, & the guy there tells me that those tires are so stiff side-walled & our cars are light enough that they'd work almost like "run-flats" for a while after loosing all air pressure. So since I rambled on... I say they work better than planned on and make a good 50mile spare withought even changing to the real spare!