Is the Diamond Dust a good first "speed plane"?

If not, what is?

If so, where do I get one?

I've got 2 OS 46 FXs that are nearly new and run great, and I decided to try one of these fast 40-size singles. I had a duellist that went well in excess of 100 mph, but was a twin and therefore a fair amount of tweaking and syncing the engines.

Any help would be much appreciated.
Stu