It's a good idea... SLCC is one of the better community colleges i've ever seen, and i'm sure you can plan it so all of your credits transfer to U of U.
No dorms, but housing around SLC is easy to find. Also, U of U has this new in state policy that is you live in Utah continually for 12 months you get instate.... so if you go to SLCC for a semester or even a whole year it'll end up saving you some money. Might as well get those Gen. Eds out of the way for cheap then transfer when tuition is like $2000 a semester.