Tim, ignore all suggestions of keeping your plants outdoors in the winter..Virginia and Oregon climates simply do not apply to you.
what people can do there has zero relation to what you can do in Pittsburgh.
From reading everything you have posted, IMO your best option, by far, is inside the garage for the winter..
put them up against one of the walls that the garage shares with the house, away from the garage door, and they will probably be fine..
MUCH better odds than being outside! dont worry about the cold as garage doors open and close..as long as the doors are closed at all times except when a car is going in or out, thats closed doors 99.9% of the day and night..
Don't worry about light..your plants will be "fully dormant", not growing at all, and will not need light.
(I have been over-wintering my Sarrs and VFT's in complete darkness and 35 degrees F for almost 20 years..they do just fine)
yes, your garage might be a bit too cold, but I bet they will be fine..
the garage is probably much warmer than you think, especially being attached to the house.
If you are still worried about the cold, you could "wrap them up" tight in plastic, like I do, sit the pots up against the "heated" wall (getting warmth from inside the house)
then cover the pots in old blankets or some such material, to hold in what little warmth they get from the wall..
get two or three cheap thermometers and scatter them around the storage area, to keep an eye on things.
for the ideas on the "wrapping up" process, check out my webpage,
and here: http://1stclass.mylargescale.com/sco...CP/page5c.html
Sarrs and VFT's do fine in the low 30's..and even a light freeze or two wont harm them..
I think your garage will probably work fine..its the best option you have! I bet you can make it work..