Do you expect another bad winter? Not sure what that involves in BC but you might consider that all weather tires are not true winter tires, and wider tires have a tougher time with snow than narrower tires. 
We ran Vredestein Quatrac 3's on our 2006 from almost new until we sold it recentlyHi guys, for the past 3 years, I've been maintaining my girlfriend's 451 here in Vancouver, BC. We only have one parking spot at our apartment, so I've given up my ride (SLK230) and this is our only car for now.
I've read through the numerous threads about changing up the tires and have learned a lot, but I thought I'd ask for a recommendation anyways. I've ordered a set of rear wheels, planning to run the same size on all four corners. After the horrible winter last year, I figured I better get this car ready to tackle some unexpected weather. I think I'll give all weather tires a try and have settled on the Kumho Solus H31 based on price and availability.
Would you guys recommend sticking with 175/55/15 or go to 195/50/15? They will be mounted on stock 9-spoke rear wheels (5.5). Thanks for any input!
Oops, sorry yes I meant the Kumho Solus HA-31. I did consider 185/55-15 as well. You're right, perhaps that is a good compromise in between. 195s are at the limit of what the wheel size can handle, although it sounds like lots of people have made that combination work and it's the closest to the original size. 185/60-15 has the most options (some at really great prices), but I'm not sure if I feel comfortable with the potential rubbing and +5.1% difference.If you only had to have one set of wheels, then I'd recommend the Kumho Solus HA-31 in size 185/55-15. That's a good, compromise tire size for a vehicle that weighs around 2000 pounds. You said "H31" and I don't know if that's the same tire or not, but I have heard from a couple of people that the HA-31 is a pretty decent tire with better than typical snow performance.
....or really big hands......... (you need 3 hands for this).
Just a word of caution about pulling the fuse, It will also disable your anti-lock brakes. just so you are informed.
Another unknown feature of the 451, hold both buttons next to the speedometer and turn on the key. (you need 3 hands for this) and TCS will be disabled until you shut off the car and restart it.
Joke, or no joke? Bumped into someone at the local O'Reilly's that said some jiggy dance did the same thing on Mercedes, (or was it BMW). (I'm afraid I didn't believe him.)....or really big hands....
Jetfuel...big shoes too....