I'm going to go a little further than some of the others and suggest a 996, whether it's AWD or just rear wheel drive. The newer cars are just so much better as daily drivers, and with ABS and TC/PSM, even the rear wheel drive cars are hard to beat in the winter. All you need is a good set of winter tires. You can find used wheels on the "parts for sale" board here or Rennlist. Some may even be for sale with winter tires already! 
I drove my Boxster for two years in winter w/o any problems what-so-ever. The first year I only had the winter tires (Dunlop Wintersport M3s). The second year I go the hard top.
If you don't want to go that route, then yes, a 964 or 993 with good winter tires will be fine in the winter (I've done a lot of "research" on this). C4s will be even better. Just remember all the "other" factors when shopping for these models.
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Doug
Currently Between Porsches
PART OF MY SOUL: '09 Boxster 2.9 PDK, '86 911, '76 912E, '06 Cayman S, '90 911 C4, '74 911, '78 911 Targa, '01 Boxster, '70 911T, '99 Boxster (#2), '72 911T, '88 911, '99 Boxster (#1), '84 911 Turbo Look, '73 911 Targa, '88 944
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