Your story sounds very similar to ours. We had about 6 PB's come over and give us bids. None really came close to matching what I thought I deserved for the price, so after finding this forum and talking to some people who did it themselves we took the O/B plunge as well.
We finally got water in it last month and so far I think it's one of the best decisions we could have made. There's always a few things you learn along the way and if I did it again, I'd probably make a few minor tweeks, but overall, I think you'll be happy with your decision. Not to mention, it's kind of fun being in charge of your product and not having to get permission for idea's that spring up (as was the case with us, but perhaps you already know exactly what you want).
Good luck!