I need around 600 watts to fly nicely, and scale. Just for an idea my previous choice in power would have produced 9 3/4lbs of thrust static. In a model weighing in at 8lbs or less thats vertical.

The Stuka doesn't require anywhere near that kind of power. If I decide I need more power or prop I could go with a big Axi outrunner brushless which can produce roughly 900 watts. Thats over 100 watts per pound. It's always good to have a little extra power to be safe.

The Mega 22/30/3 will give me around 650 watts. I may end up going to an Axi though. It'll all depend on how I feel once it's built, and how many cells I can squeeze into the fuse. Also weight will be an important factors.
If it comes out heavy I'll likely switch to something with some more power. If I come out around 7lbs with batteries though I will have plenty of power.
One other reason for the Mega 22/30/3 is later if I want I can use it for a large ducted fan.