Depending upon your budget there are any number scanners that would probably work for you. Do not get the DJ Scan! Consider the following fixtures (in no particular order):
ADJ Scan250 Deluxe
ADJ Peformance Scan (similar to Scan250, but has rotating gobos and a separate shutter/dimmer channel)
Chauvet Intimdator 2.0
Martin SCX 600
The above are all halogen lamp fixtures.
ADJ AccuScan
Chauvet Q-Scan250
Both are 250w discharge lamps.
One of the keys to movement can also be the controller. 8-bit motors are not as smooth as 16-bit, but the joysticks on most controllers really suck. If you are using a controller that allows the use of sliders, practice using these. Once you get the hang of it, the "live" response will be much faster and smoother. Of course, YMMV....