Reading Topic: What works!
This won't work. Some +45 offset rims are not actually +45 offset. All 215mm wide tires are not even CLOSE to 215mm wide. Aggressive tires should always be wider than cheap all-seasons. Rim width matters. You can't generalize like this.
Add to that the fact that I'm sure a lot of people are rubbing and clueless about it, and you'll see why this won't work.
Look at Crossbow's picture. That's the only way short of removing your shocks to determine if you will actually rub or not. All that, "I didn't rub until I lowered my car" stuff is bullshit... the wheel travels in the same path regardless of the springs you have installed. All this tells us is that you drive like a weeny usually, and you never actually used up your suspension travel on the stock springs.
The best upgrade you can get for your car is better tires. Better tires are almost always wider, regardless of their rating. This is because tires stick better when they distribute their load over a larger surface. To accomdate such tires, you want a very-close-to-stock offset. I'd try to stick with a +55 offset, if possible, but nobody makes an aftermarket wheel like that. Try buying RX-8, RX-7, IS300, or MSProtege OEM wheels.
Just to throw off your results, I'm on a quoted +50mm offset on small-diameter 16x8" RX-7 rims and inch-smaller diameter Yoko AVS-I 225/50/16 tires. I still rub. If I rub, how is it possible that some of the above people don't?
Threads like this have come and gone, and people with identically spec'd setups have had very different results. Again, you can't generalize like this. Change your wheels at your own risk, and realize that a lower offset will fit at the expensive of tiny, crappy tires.
If someone wanted to compile a spreadsheet detailing everything from tire and wheel brand and model, that would be more useful information.
As Crossbow said, be sure to indicate how you drive... but I sincerely doubt most people here, even driving aggressively, would get to the point of rubbing. I was rubbing, but didn't realize it until I installed the Eibachs. The '6 has a lot of suspension travel and has stiff shocks to slow wheel movements. You'll have a hard time rubbing on the stock springs unless the car is full AND you're cornering AND you hit a good bump. Check your rear tires for minor scrapes and the top of the fender for small bends.