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

I am looking to put up a detached garage and I am leaning towards a metal building (for the following reasons: price, ease to install, no termites, and strength). The size would be about 30' X 50' X 12' (for a lift) and built on a slab (haven't poured yet). For those of you that have installed or have one, I would like you feedback. I've looked at a view companies, VersaTube, Ironbuilt, Heritage, and a couple of others. I like the idea of ease of VersaTube but it is pricey for what it is. I am leaning towards Ironbuilt as I like that they have thicker, wider seals where the metal meets.

Is there a way to "termite proof" a wooden structure? I thought a wooden one would be easy to build in my own timeframe and I am comfortable building one this way (built a good size shed before). I can match the house easier with a wooden structure too.

Thanks