[I tried replying via email so if there's a delay with that method, this will be a double post]
I have an imac in Seattle that I had offered up a long time back, maybe a year ago, exchanged a few emails with someone in this thread, was approximately one email away from bringing it down to their office and then no more emails. I've still got it here if they're interested. I am one of the few in this thread that does not have the Wacom drivers installed and was seeing the hang seemingly just from clicking too rapidly. I am happy to sell/rent them the imac.