Small block strokers

Good machining costs money. As does dyno time especially when you don't own one. However, you should be able to achieve your goals without dropping $9K, even with Mike building it. Ask him to do something lower budget than his "550hp recipe" deal. There are many decent shops, and probably something closer, and plenty of decent "power recipes" around. You should be able to get something under $6K with decent parts in it.
In regard to the other link - I'm not familiar with the site but the posts lead me to believe they have their heads up their asses. A little knowledge is a bad thing...

I really thought my goal of finding a drop in crate stroker for between 5K and 6K was reasonable. But as you've stated good machining and dyno time is expensive. - And I'm sure that all shops are not the same. There have always been those guys out there that are consistently much quicker at the track. - Most of whom seem to have put a gazillion bucks into their motors.

I hope I haven't given folks the impression that Mike is overpriced. I assume you're getting a great motor when you do business with him. I just don't know if I can justify spending that much when I see a 426 Hemi (incomplete) selling for 6K here on FABO.

550 HP is way more power than I'd have expected to be able to pull out of a streetable LA engine. The thought of it makes me damn near giddy. - Still, I'm hoping for more info on other options.