I've run 205/45/16, 215/40/16 and im now on 195/45/16 due to financies when i needed new tyres, the 195s are significantly cheaper than the 215s... All Toyo T1Rs!
The 215s provided the greatest grip but i used to get some arch rubbing at the rear when 4 or 5up, the 195s do break slightly sooner than the 215s would as theres 20mm less tread width on each tyre touching the road...
The 215s looked best on the rims aswell!
I will be swapping back to 215s as they are my preferred choice, i will have to trim a little of the rear archs to accomodate them!