Many micros go with seasonal beers. This works in a couple of ways:
- gives the punters something new to drink every few months
- keeps things in line with the seasons, eg. weizen in summer, dark ale/porter/stout in winter.
- gives you the only practical way of judging which beers your customers want, by the sales of each of them.
Personally for winter I'd do a porter or oatmeal stout. And dont forget a beer that ladies wont mind drinking, something similar to the james squire golden ale goes down well with the female contingent. Low bittering hops, slightly sweetish and a bit fruity with the flavouring/aroma hops.
A Swarzbier or Kolsch would be fantastic, but dont skimp in educating the public in what they are (I barely know myself). Lots of people aren't too adventerous with strange, foreign sounding beers, so you have to get them over that hump.
Good luck with the venture, I'll have to drop in for a pint next time I'm over.