Put the snow tires on the OEM rims for the winter and get some High Performance tires for the upgrade to 17 or 18 inch. Since you live in an area probably riddled with potholes go with a 17 inch wheel for the comfort and 18 only for the look and conversation.

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1998 MERCEDES-BENZ E430
OBSIDIAN BLACK METALLIC/BLACK LEATHER
XENON H.I.D. HEADLIGHTS
DEBADGED REAR
AMG CHROME TIP DUAL EXHAUST
CARLSSON 1/6 Wheels/DUNLOP SP SPORT 5000 from TireRack
SLK BLUE "WREATH" CENTER CAPS
ATP FLASH Wheels/YOKOHAMA AVS dB from TireRack
ALPINE CHM-S611 CD CHANGER
FORMULA ONE TINT