Yep 60amp is fine for a 17.5T touring car. I've heard a lot of different theories about how the ESC amps matter, but basically the ESC is a conduit, it doesnt push current into a motor or anything. A 17.5T won't draw huge current in blinky racing, so as long as you have a decent battery then it'll be fine.

A 160amp ESC might be faster, but not becuse its rated at 160amp, its because it is higher spec and will probably be made with better quality components and have lower internal resistance. For your first car you won't notice the difference.

I'm assuming your new to racing since its your first TC, so I would start with the 60amp ESC and when you are a consistent driver and chasing the fast guys then spend some money on new motor and ESC.