"the 850 lineup has a few sets of tires as OE but I think the real question is whether or not Volvo actually bothers to re-calibrate the speedos and tachs based on these different tire sizes they use as OE."

That's exactly my point. What circumfrence tire are the tach/odo/speedo calibrated for? It couldn't possibly be calibrated exactly for all three OE sizes. In fact, it may even be calibrated for something in between the lowest and the highest while not being either of the three. If I knew the exact circumfrence it was calibrated for, and I could find out the tolerance, I could then make better calculations as to what is acceptable.

I also thought about the -1 degree of camber helping with rubbing, but when you think about it, it probably won't. It won't because it isn't the outter corner of the tire (corner being the point where the sidewall and the tread meet). It is actually the tread that rubs. So -1 degree of camber won't make any noticeable difference.

BTW, how are you going to get the -1 degree of camber? I found some camber paltes on carparts.com, that should work on the front wheels of the 850, for about $27US. But I'm not planning on doing any suspension work this year besides the strut tower brace. This year, all the available car money is going towards power increases, the strut tower brace and the stainless steel brake lines. The suspension will be worked on next year. I may just go with the Koni's, set them on the stiffest setting with the iPd springs or go with the Bilsteins with iPd springs, as these two combinations should give me the .5-1" drop I'm looking for. I'm not so much looking for lowering as I am for stiffening up the suspension. With the 17" rims I will be running after I wear through my 205/50/16 Toyo Proxes T1-S's, I will more then likely be running 205/45/17 tires. And I don't want to lower the car enough to cause rubbing, so I hope the 1" max drop I want won't rub.