What are you looking for, a billing company or a PM system? What time frame do you have (is your system at least functioning at this time)?
While I have not heard of DAQbilling, that's not a knock against them, except to say they probably do not have a large AC base.
There are a number of billing companies that AC can recommend, it may be worth talking to them.
There is, of course, the integrated Amazing Chart's PM system they have recently started. See other posts here about that. They are just getting up and running and I do not know the lag time to implement it.
There are MANY PM's that work with AC...
Some are through X-Link and it has been reported they have issues (not the least that the X-Link system is expensive.) Some are direct like Kario and EZ Claim. There are a bunch (about 70 by my count) through HL7 interface.
Go to the administrative options/interfaces and scroll down to Practice Management to see what options there are.
How easy are they to work with, how do they fit your needs? Now That's the question?