Heres a couple thoughts on your agenda. First of all, do you mean a picture when you say good shot, or do you you want to just experience a bout of thundersnow. If your really determined, I've always felt there are three locations/scenarios where your most likely experience it.
1.) Lake Effect, the larger the Delta T's the better off you are, Later October and November storms are your best bet.
2.) Orographic situations, but a fairly potent system is usually necessary as well.
3.)SE NewEngland during strong Nor'Easters.
Choice 3 is there to prove the point that all it really takes are situations with extremely intense snowfall rates(extreme instability) More snowflakes equals more electrostatic induction, and there you go.
This leads to the other part, any situation that will produce thundersnow will also be producing extreme whiteout conditions with snowfall rates of probably 2-5 inches an hour. Therefore, all you really see is an amazing diffuse flash of light. I recently chased the 10/12-10/13 storm in buffalo, and experienced countless lightning and thunder throughtout my whole chase. But the flashes were very unique, they had a somewhat organish hue, which I attribute to intense refraction through trillions of flakes. In Summary, if you want to experience thundersnow, get yourself into a LES band. If you want to film it, I'm not quite sure how you'd achieve that.