Sage Healthcare
We use Sage Intergy, which has integrated EMR, labs, Rx and whole works! Their support staff is great. I would'nt say I have seen/used all EMR's, but this one is way up there!
We have implemented EMR's for 2 practices, the software has a lot that we can do and gives you the options to customize and automate a lot of activitys that are performed on a daily basis. Plus, Sage owns Emdeon (clearing house) and Envoy LLC, hence any claim that we need proof of timely filing for, we get a letter from the clearing house that a particular claim was submitted to the payor with this file ID and on that date and that time. That is really neat!
It is a bit expensive then most, but when you are managing all this data, you need a strong company that you can rely on!