I have Oxford heated grips too and they get plenty hot and keep your fingers from cramping up in the cold. Since the wind hits the knuckles you will still need a good pair of winter gloves.
I also have a heated vest wired to the battery. It keeps the core warm and allows you to ride with fewer layers of clothing which is more comfortable.
Last winter I rode with the qualifiers (got the bike in Nov) and they were great. I now have Michelin CTs, they feel great too.
I rode with the temp as low as 0C or 32F, (as long as the frost was off the road and not rainy) but not far at temps below 5C or 41F.
Here in Victoria it doesn't snow often so the roads aren't overly dirty, but frequent washing/drying/waxing and chain cleaning/lubing have kept my bike looking new (> 20,000km

).