steel buildings

[mopinko]

so, i am buying a piece of vacant property, and basically looking to start a "farm".
i need a barn. i want something i can park a couple cars in, but also a little tractor, a giant snow blower, and winter home for chickens. prolly space for a project or 2 here and there.
this is a shoe string kinda thing, as we are maxing our home equity to buy it.
a steel pole barn sort of thing would probably be the most affordable, and likely ok building code wise. but can you get them with enough insulation to make it inhabitable/heatable? and is the design flexible enough for us to do some passive solar/natural light?