Rick - this company put in our AC in 2011.
https://plus.google.com/113187055363579032108/about?gl=us&hl=en
Paid $5200 otd for a 13 seer Carrier. The guy really seemed to care about what he was doing. Our AC died in the middle of summer and he understood that the new unit had to be installed asap. His assistant wasn't available so he told me he had no choice but to wait a day. I told him I could help and he jumped right in.
Our air handler was also in the attic of our single story house. We ended up cutting through the drywall and studs to get it out then just put it all back together when we were done. I took care of the drywall repair the next day.