I wouldn't take Robert Quinn or Aldon Smith, or any OLB propsect at #15. It doesn't make sense to me. First off I can't sign off on Quinn because he didn't play football in 2010 and the last time we did see him play football he was terribly inconsistent. I mean I just recently watched him get shut down by junior ECU tackle Willie Smith not too long ago, and Willie's a late round prospect. Aldon Smith is an exceptional prospect, but the fit isn't right. I'm not convinced he belongs as an outside linebacker (nor Robert Quinn for that matter). And what role is Aldon going to play in this defense? If you're thinking of replacing Cam Wake that's one thing, but I'd have a hard time figuring out why you want to do that. In Mike Nolan's defense he needs one of his OLBs to be a guy that can legitimately cover and play the run, be a 50% cover guy. That's Koa Misi. Don't screw with that. Screw with that and you HANDCUFF Mike Nolan's defense, making it predictable, less adaptable. So many people don't understand this. So then you're left with Aldon Smith being a nickel rusher, while Koa Misi is a 1st and 2nd down guy. That really minimizes the value of BOTH players...and is that what you really want to do? I dunno about that. Maybe. Maybe it'd be awesome. But it seems like a gold plated television remote control...a luxury.
As for other "best players available" you have I think Anthony Castonzo and Gabe Carimi. I love both players. I think Castonzo is a fixture at Left Tackle for a decade or more. But, we have one of those. Why do we need another? I doubt he plays in at Guard, and we have Vernon Carey at Right Tackle. I have a tough time believing that 7 years into Vernon Carey's career, only 6 of which he actually played, he's just done. I doubt that. I think getting rid of him is totally unnecessary. And Right Tackle might not be Castonzo's best position anyway, so if you take him you're really just destroying a lot of value...destroying the value of Vernon Carey, making him move to a Guard position where he's both overpriced and out of position (and that's if you don't just cut him), and also destroying Castonzo's potential value as a Left Tackle by making him a Right Tackle where I don't know if he's as suited to it. As for Gabe Carimi, he might play Left Guard. MIGHT. It's a projection, never played there before. But to take him at #15 as a Left Guard you damn well better be sure he's the next Steve Hutchinson and I'm not sure how the heck you can be sure of that as he's not played there. He's played Left Tackle his whole Wisconsin career. Why move him? Why ruin a good thing? He moves to the right side now, where he's never played before? I wouldn't assume that either, some guys are not very versatile moving left to right and vice versa. Awful big projections if you take either Carimi or Castonzo at #15.
Prince Amukamara is a special player. I have a lot of confidence in him. If he's there at #15 that's a tough decision for me, because I have so much faith in him. But you do have both Vontae Davis and Sean Smith, and Nolan Carroll, and Will Allen, and Benny Sapp...you can always get better but damn. Can Sean Smith move to safety? If so what happens to Chris Clemons? Does Sean Smith have the tackling skills to move there? What if Smith is just better than Vontae, you comfortable leaving Vontae on the bench while Prince and Smith play? Nolan Carroll never sees the field even though he showed what I feel is a LOT of promise in 2010? Difficult questions.
So then you're left with some other positions that haven't been considered much...like wide receiver where I fully believe Leonard Hankerson is a worthy get at #15. Or inside linebacker where I like Martez Wilson for the same. Or Mike Pouncey even though I'd probably vomit if we took him. Or Mark Ingram.
And if you don't like any of those four names at that spot...then you're pointing yourself RIGHT back at the quarterback position.