I am investigating purchasing TestDirector for integration with our existing DOORS 7.1. From the information on Mercury Interactive's site, they support integration between DOORS 6.0 and TD 7.6.
Question 1: Do all DOORS versions of 6.0 and up support TD integration?

The sales person I'm speaking with is dodgy in answering questions. He has stated I would need TestDirector Enterprise (no mention of version for integration) or TestDirector for Quality Center in order to integrate with DOORS. Then gave me the standard line that Telelogic is currently working on getting the integration working for the latest version of TD. I'd rather purchase the version that currently supports integration.
Question 2: For those of you currently working with TD and DOORS integration, what versions of these two products play well together reliably?