Metal Buildings, best company to use, also wood construction ?s

I have seen a lot of the versatube style buildings around and the price always seemed cheap but there are a few things to consider, I don't know where your at in Georgia but the one thing that comes to mind is how do you insulate the metal buildings? I know that northern Georgia can get pretty cool in winter where you would need heat and I know for a fact that the southern areas are only slightly cooler than Hell in the summer so you might want some insulation. Stick built garages are easier to insulate, wire for electric, and hang stuff on the interior walls. If your doing it yourself it would seem that the stick built would be the best bargain since half the lumber in the country probably comes from Georgia anyways. Just food for thought.