Sounds like you are pretty well on track brother, I'd have to say your only contentious point is on barrel length. After a certain barrel length, you aren't making any substantial gains in accuracy, you're just adding weight and barrel whip. In your case, 16" is plenty for what you're wanting to achieve, and the only thing that is going to hurt you with regard to accuracy is having too thin a profile. That shouldn't be a problem if you're ordering a custom barrel anyways.
EDIT: Oh, BTW, welcome to the forums! <thumbsup>