Cardiac, thanks for your excellent thoughts---my direct comments are in red bold under yours above.
I think that the Cardinals' main targets at #13 are as follows:
1. David DeCastro, G, Stanford. He is the main reason why Whisenhunt and a cadre of Cardinals went to Stanford's Pro Day. Whisenhunt fell in love with him at the Combine and I believe it was Whisenhunt who provoked DeCastro by asking him if he only benched pressed the 225 19 times, which caused DeCastro to nearly flip the table over to get at Whisenhunt.
T Jonathan Martin does not seem to fit the Cardinals' profile at tackle.
2. Michael Floyd, WR, Notre Dame. As tempted as the Cardinals might be to pick 4.3 blazer Stephen Hill of Georgia Tech, Floyd would be much more productive in the Cardinals' offense because he is more physical and versatile. Although, seeing as Whisenhunt is a Georgia Tech grad, if he has assurances from the Tech coaches that Hill is every bit as physcial and versatile, with his amazing speed and 28.3 ypc average last year, I could see the Cardinals taking him, especially if DeCastro and Floyd are off the board.
3. Mark Barron, S, Alabama. This is exactly the kind of physical, aggressive and athletic run and pass defender the Cardinals want. With Patrick Peterson in the fold the Cardinals could be on their way to building one of the most elite secondaries the game has known. Barron next to Peterson would be unreal.
4. Luke Keuchly, LB, Boston College. I think that they expect him to be off the board at #13---but if he isn't, they will think very hard about him. Paris Lenon is in his mid 30s, Steven Bradley may be better suited to play SOLB in this system and with Keuchly you never have to take him off the field. His instincts and ability to make plays on the ball are off the charts.
5. Trent Richardson, RB, Alabama. if he should slide, perhaps because of his injury or the other talent in the top 12, the Cardinals would think very hard about taking him because he fits the offensive system much better than Beanie Wells...and Wells will be a FA.
6. Cordy Glenn, T/G, Georgia. Fits the profile---and then some. Awesome mix of size, power and surprising agility.
7. Stephen Gilmore, CB, South Carolina. Richard Marshall part deux, only better.
OLB Melvin Ingram would be on this list---but he is likely going to be a top 10 pick---and I think OLB Nick Perry and OLB Andre Branch are high up there.