[messel]

If you can clear your mind of all the attractive tech that could potentially fill gaps, it may help isolate the essential needs you have. After reading your description I didn't have a solid idea of what you were working to accomplish so it's tough to judge.

Then add technology as necessary. I bet you'd be surprised what you could accomplish with couchdb, or node/express+a DB alone.

I'm wet behind the ears with web development (just started late last year), but look forward to seeing how you and your team makes out.