Hi, I've just spotted this one...
With the budget you've got, there is only one way to convert Jomsocial to a native Android app, and that's with iJoomer Advance ([login to view URL]).
I've used this SDK numerous times for my Clients. The UI is ugly, but can be re-skinned without too much hassle.
As you may have noticed, I'm new to this site, (but I've been in the mobile sector for 12 years). I'm very keen to get off to a good start, with some good feedback, so rest assured I'll do a good job and turn it round in a very reasonable timeframe.
I'm happy to talk through the project with you before making your mind up. iJooma will let you incorporate other Joomla frameworks too, like eSobi etc, so if you want to discuss the possibilities, please just let me know.
Regards
Mark