Should I pay a machine shop $160 to hone my cylinders?

Just ream off the ridge yourself.

If you're building an 8000 rpm racecar, sure. If you're just freshening up whats there already, do the work yourself. Then you get bragging rights and that $160 stays in your pocket. I mean you already have the tools (from your other post) so just keep working with it until you are satisfied.