What drives the other side for me is if your unit goes bad in Las Cruces, NM, you can go across the field and buy a new turn coordinator or whatever and be flying again as soon as you have it installed. With an EFIS, you may be there a few days while it goes to & from the factory, plus remove and replace time and maybe a weekend if it arrives at the factory on a Friday. This is not a predictable cost, but if it happens, you may wish you had gone with steam, regardless of the cost difference.