Most of the posting in this thread has been from Sly (terrible builder) and Stoned Beaver (only plays peewee).
Just skim the thread for TJ, reddog, and Dave's posts and that's all the information you need. Tomcic's post above mine has some good information too. Dave's QB that he posted is perhaps the most efficiently built QB I have ever seen.
Here is the build for my QB on one of the few 100% pass teams in the game
http://glb.warriorgeneral.com/game/player.pl?player_id=4620497 reddog's team just beat him in the Casual Pro championship and I have no problem opening the build because it looks pretty much just like he would expect it to.
QB is not a build with a whole lot up for debate due to how it is used on the field and how so many of the better builders have experienced the same results. As a general rule confidence can be in the range 65-85 and maybe 5 beyond that for a particularly efficient build. Below 60/65 and performance starts to become noticeably worse, above 85/90 and you've begun to use too many build resources on confidence, damaging the rest of the build.
I have personally built QBs with 60, 64, 70, 72, 75, 77 and 82 confidence. Some on all passing teams some not, all through end build and most with multiple golds. My experience is the same as most, which is that 70-77 or so is the sweet spot, but it's not a dramatic difference either way. The QB's build is ultimately a very small percentage of the passing game, and this is a very small percentage of the QB's build. I have won RPE on a 100% passing team using a day 760 QB.