A surly cross check with a sturmey archer 3 speed rear hub, easily held in place in the rear drop outs and with down tube shifter mounts you can fit a sturmey archer 3 speed changer easily. Of course if you do not like having your shifters on the down tube there are a few other options as well which are -
Bar end shifter
Seat post mount - might look a bit weird while changing gears e.g what are you grabbing between your legs !
Handle bar mount - Sturmey archer make one
Handle bar mount using a Dixna open clamp mount - I can sell you one of these if you need one
Stem mount - another Dixna product
Retroshift CX1 - the Goats at retroshift tell me it is possible to fit a 3 speed shifter to their CX1
Trad Sturmey 3 speed bar trigger
So as you can see there are plenty of options for mounting a 3 speed lever to your cross check frame, why a Surly cross check, its one of the few reasonably priced production frames on the market with down tube shifter bosses , you can run it geared, single speed or fixed and best of all FFF - Fatties Fit Fine yes that's right you can fit up to 700 x 45c tyres - how many cross bikes have enough space for such wide tyres - not many I can tell you and in snow wide tyres and low gears are what you really need. The reasoning for the Sturmey Archer hub is quite simple as the gears are contained inside out of the way of the muck, dirt & slush so you only need to worry about maintaining your chain, what could be more easy and if you run your cables up to the top tube using Sturmey archer clamp on guides you will have a trouble free all season bike that with the right tyres can go through snow, mud & slush and still keep up on a road ride when the weather is nice with narrow tyres.