Get a set of Blizzaks on some cheap wheels for the winter. Blizzaks rock in the snow.
Bridgestone.
mbworld is good too. Yep on both.
Learn how to do Maintenance "A" and "B" yourself and you'll save a ton of money. Buy a "topsider" for changing the oil (warm it up first), and a oil filter cap wrench. Buy the fleece oil filters from Gary. You do not need to change the oil until it tells you to! I have been doing that as long as I've had MBs with FSS. My last one went about 18,000 miles between changes - sold it at 357,000, not burning oil, and it's still running around town more than a year later.
I buy my gold cap Mobil! at Walmart - about 25 bucks for a 5 quart jug. A change is about 8 quarts.