I had mentioned this earlier. Flex is amazing for this. Coming from a pure C++ background I had no difficulty learning it for implementing some custom remote monitoring UI for our games. The documentation is quite comprehensive and the learning curve is not too steep either. If you know javascript or have some knowledge of functional programming it makes it a lot more easier.
So my only issue with Flash/Flex is performance. They are both amazingly easy to use, but even just making a simple ball that bounces around the screen pong style isnt silky smooth. (The framerate is set at 60) Im worried that if just one ball isnt silky smooth, 100 objects moving at the same time would look bad.
Based on the nature of the game I am developing timing needs to be very precise, Im also very picky about choppy graphics.
