The ability to start up an Extra-Large EC2 instance running OSX and connect to it using NoMachine. Combine it with a simple client that runs locally and rsyncs

The ability to start up an Extra-Large EC2 instance running OSX and connect to it using NoMachine. Combine it with a simple client that runs locally and rsyncs pictures/music/etc from a local HD with an EBS mounted to the EC2 instance. (I want a MacPro so I can do photo processing and programming in the evenings, but I don't want to spend $3.5k for a machine that will sit idle 20hrs/day.) (For this to be workable I'd also need a fiber connection - but I'd pay for that too, if it was available.)