For colder weather, you'll need an insulated cabinet and a relatively high output heating element of at least 800 watts.
I've read some complaints on the Bradley not having enough punch to get up to a decent temp range for typical hot smoking (225*+) and they are rather spendy IMHO, so that would not be a good choice. The MES (masterbuilt electric smoker) would do much better and prices range from around $180 for the older generation MES 30" to around $400 for the stainless door with window on a newer generation MES 40". You can also get the 40" in the non-SS/window models.
If you need info on recipes and processes for your sausage, check out the sausage forum...lots of members have posted their results:
Not an electric user here, just passing on some of what I've read here over the years. Hopefully others with practical experience in electric smokers and sausage will see this and give you some additional recommendations and tips for the smokers they use.
Best of luck on your quest!
BTW, please drop by the ROLL CALL forum and introduce yourself so we can properly welcome you to the SMF family.