Let's put it this way - I don't mind building my own - in fact I think it would be fun.
But this is a home theater first, a DIY project second.
My budget is extremely tight.
My number one priority is bang for the buck.
If the Behringer 2030p or Polk Monitor 40s are as good as (or very close to as good as) the Madisounds, then I'd go with the purchased options.
If the Madisounds provide a reasonable upgrade over them, then I'd be happy to put in the work.
So your opinion is (given that I don't mind making them) I'll get more quality in a final product with the Madisound option?