I wouldn't do a total repaint/powder coat on any of them. Find some touchup paint that is a good match and have at it. The Bianchi would probably be the toughest to match but an auto supply store that does paint mixing should come close. I have had NAPA Auto do color matching for me with good results. I just brought the frame/bike into the store and they matched the paint. If money is burning a hole in your pocket buy another bike.