One of the best pieces you've written, Harry.
I pretty much agree with your odds by position; though I think Dennis will stick to his "best player" MO and this could skew the odds somewhat.
Having said that, the three positions I'm zeroing in on at #8 are:
OLB - I know Johnson is the top-rated guy here and that he'd pair up nicely with Dansby, but I have this gut feeling that Ware is going to skyrocket up the boards (i.e. small college guy with great athleticism and tremendous upside - 6-4 232 before the Senior Bowl, but weighed in at about 247).
RB - Benson, Brown or Williams in that order; though the addition of the more explosive and "jukey" Williams would better compliment our pounders (Shipp and Hambrick).
CB - Either Rolle or PacMan. (The other 3 or 4 guys all seem to meet our needs, but figure to be rated a peg lower).
If Dennis is true to his principles, you can't overlook the wideout position(Edwards, Mike Williams, Clayton) but I fervently hope that the Best Available Athlete at #8 turns out to be a non-receiver. I also agree with you about QB (though Alex Smith might conceivably be rated that high by some scouts; and if we can't land a FA, we're going to have to do something).
With regard to "need", we can use help in the interior of both lines, but I don't think any OG's or NT's deserve to be rated as high as #8. Besides: Reading the Coach Green Tea Leaves, he's talking a lot about how the presence of two tackles rated high in the draft will "cause more skilled prospects to drop down further."