John K. is THE guy to go to for escrow.  Everyone who's been on the forums a while knows that.

You say that as a new vendor you want to build trust.  Accepting purchases using John K's escrow service is a great way to accomplish that IMO.

You don't need to look far to see that John K's reputation speaks for itself.

If you would rather use a different escrow agent I would also be fine with Graet or bitpop.