The other question of course is do you need it to be salt water proof so it can be mounted to the car with a cord coming off, or do you want one that just has a little cord pigtail coming off it and the charge will stay safe and dry in the garage.
For a 60 amp hour battery you shouldn't need a charger larger then 1 to 1.5 amps if it's going to be plugged in every night.
I'd go with something like this
Amazon.com: NOCO G1100 NOCO Genius Gray 6V and 12V 1100mA (1.1A) Fully Automatic Battery Charger and Maintainer: Automotive because it's a sealed, solid state charger and I think all of their chargers are made in the USA.