Safeco is not the best, but if you have a classic car you want to drive as your regular vehicle, Safeco is the insurance for you. Safeco allows you up to 10,000 regular use miles which is similar to what someone may drive on a normal policy. Most collector of cars are not looking to drive them regularly, but if it happens your 1968 Ford Mustang has to be your premier car, Safeco is your best bet. The limitation to Safeco is its stricter list of vehicles it will insure, including a ten year required minimum.
Oh, there are a whole bunch. The big ones include good driver discounts (for going long enough without a moving violation); affiliation discounts (for belonging to a group, like AAA or AARP, that partners with the insurer); low-mileage discounts (for, you know, low mileage) and car safety feature discounts (for installing stuff like emergency break assistance or collision avoidance systems). You can find a full list of common car insurance riders and discounts here.