Hey duc, yeah i havent been at work cos i have this flu thats goin around atm. 17cfm should be fine. so your painting this weekend? i can help, but it depends on how well i am
brush a bit of paint onto any exposed bare metal in the scratch to prevent it rusting, that should work as a temporary fix until you save some cash and figure which panel shop will do the best job/price.
machine polish lambswool pad & a gritty compound, then use a finer glaze polish on a eggpad buff, then finish off with say a meguires hand-polish. This is the process i use at work and comes up like new every time