If you haven't checked out Mirth in it's v3 format, it's not terrible. I find that alot of the hold-up with HL7 setup in regards to logic involves VPN setup and cloning/maintaining different channels that basically do identical things. We've built some tooling on top of Mirth to do this where I work and I think it's a better approach than black box integration solutions.

That being said, I'll definitely be checking this out.