I don't blame you on the price. Some of the prices right now are insane. The only motors that I've seen that are really touchy are extremely modified motors, but even that is getting better as modifiers get better.
Not to many people at my track run Sirios anymore, because they tend to run much hotter than the Novas (might be partly because of the altitude). Have heard good things about the OS TR and STS motors (D3, D5, etc).
How's the Mtx3 coming?