I've got the deepgroove1 touch probe, although I think it's one of the more expensive ones now, however I can't fault it.

Repeatability is in the sub 0.05mm range, but some/most of that is likely to be lack of repeatability in the machine it's mounted on. I made up a small interface board for mine, as I didn't want to switch the KStep 24V opto directly with it, so the board means the probe is only switching 5V. The board also provides a couple LEDs so I know it's got power, and if the probe is triggered.