For professional day in and day out use your going to need to spend between $1,500.-3,000.00 for a reliable machine that will perform for you over time.
De Vilbiss and Binks are the 2 brands that come to mind that would be reliable, long term, proven, machines. I would stay away from the Wagner DIY type sprayers unless you are just doing a couple and don't care about long term use.
There should be very little overspray if you have the right tip and the pressure set right and is constant, that will allow you to operated it right.
Get a reverse tip gun for uncloging your tip quickly and a wip end for the gun.