I ride everyday year round here in north Georgia. We definitely don't get the harsh winters like I used to get up in northern and central Illinois, but it does get pretty chilly. Rarely ever any snow though, which is nice! The coldest I rode in this past winter was 12 degrees F with the windchill. I will say this.... heated grips are the M-F'ing BOMB!!! I have them on my F4i they they were a true lifesaver this past winter. Believe me they make a world of difference. I haven't tried them yet but heated gloves would probably work even better than the grips, but still the grips work very well, and they're only $30 at Cycle Gear. Of course you need some nice thick insulated gloves to go with them, but you're hands will stay pretty damn toasty with a good glove and grip setup.
As for the rest.... I wear my Teknic full leather suit, with thermals underneath (top and bottom), and a sweater or sweatshirt under the jacket. My legs always stayed perfectly warm with just the leather pants, a pair of regular pants (uniform pants for work) and thermals underneath. You can also get heated vests and jackets too which are VERY nice!
For the head..... I wear one of these Turtle Fur head sock thingys (
http://www.cyclegear.com/spgm.cfm?L1=3&L2=14&L3=&L4=&item=TFC_13201&tier2=103 ) , along with a 2nd balaclava over it. What I did was take a long strip of adhesive Velcro, and put it around the entire front half of the helmet right down at the bottom edge. I put on the head sock, then the 2nd balaclava and tuck them both in the jacket. Then put on the helmet and pull the top edge of the balaclava and stick it to the velcro around the helmet, covering the big hole between your chin and the helmet, which keeps the wind from coming up and blowing on your face. This sucks though if you wear glasses, cuz your breath will fog them up in no time. I also use a Fogcity anti-fog visor insert (which also tints in bright light and goes clear at night)
That's about it for my setup... seemed to work pretty good for me, though it could be better. I do want to get the heated gloves and vest... just not in the budget right now
After you get all the gear, you just gotta watch out for that friggin black ice.... ugh!!