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You should consider renting a house instead of an apartment. There are tons of houses for rent that are withing 20 min from the base, and that means that the prices are quite right. I'm currently renting a house built in 2000, 1700 square feet, 3 BR, A/C, for less than $1K. Just a thought.
4WD is not needed around town here. Anything with FWD would be fine...or, RWD with snow tires.
By the way, you'll love CO. I wish I could live here longer!!