How bad are the winters north of Boston/how much driving do you typically do and where? I spent some years in Boston and with quattro I would think you would be able to get by with some good all season snows (I'd recommend Extreme Contact DWS).
Had a TT for sometime and was able to get by on whatever the factory tires were. Mind you the TT doesn't even have legit quattro (haldex shared with the R32) and I was perfectly fine.. Driving cautiously obviously. I would also look into any used tire options.. Big fan of Nokians myself.. If you can find a set of used Nokian winter tires I'm sure you will be very pleased.
07 JB 335i 6MT JB4 G5/E85 Flash DCI HPF FMIC AR Catless DPs Milltek BMW Oil Cooler AR OCC 100% E85 Walbro E85 450 LPFP/392 inline Bilstein B8/Swift Spec-R PSS 255/R888 265 M3 Sways M3 Rep Front CF M3 Hood
07 BSM 335xi 6MT JB4 G5/Pump Flash DCI CX FMIC KW V3 VRSF DP LCI Rear