Lawrence,
I've had fusions at C4/5 and C5/6, and ADR at C3/4 and C6/7; so I really do "feel your pain".
If you end up going the posterior foraminotomy route, it may not necessarily preclude ADR in the future if that becomes necessary. This weekend I read
a study in which 15 patients that had undergone ACDF and/or posterior foraminotomies in previous years underwent one, two or three ADRs with the Bryan artificial disc. Six of the participants had undergone one, two or three posterior foraminotomies and then received an ADR at one, two or three of the levels at which they had undergone the foraminotomies.
If you want the full text of the study, PM me your email and I shoot it over to you.
Good luck, Jeff