Ya know, I thought about getting my wheels polished but decided that having them chromed would look better for a much longer period of time and NO future work!
I'm not sure about the cost difference, but I sent mine to LA (turnaround time about 10 days). Cost total for 4 was $600.
You might also want to consider the "new" finish - PermaStar. They are located in Pittsburg, CA. and do a great job. Not sure of their cost but you can check their website.
Good luck!