Depends on the brand of body kit on how much that would cost. Just consider that a full paint job on the car will cost at least $4,000, but probably more.
Then factor in the cost of your kit + the molding necessary to prep it for paint.
Powdercoating a set of rims will usually run you at least $100 per wheel, but usually more. I'd estimate at least $1000 including dismounting and remounting the tires.
I would budget no less than $10,000 depending on the body kit, but most likely it will be a good bit more than that.