Looks like their will be plenty of good DB FA this year, I found a list, which may or may not be slightly out dated but here are some notable names:
Rashean Mathis – JAC
Tracy Porter – NO
Terrell Thomas – NYG
Tyvon Branch – OAK
Cortland Finnegan – TEN
Jim Leonhard – NYJ
Michael Griffin -TEN
LaRon Landry – WAS

Notable names was according to nfltraderumors.co, not sure who reliable they are but thought I'd share.

Of the corners on your list - Mathis would have been a usefull addition but he tore his ACL and will be 32 next season. It might be worth bringing him in as he might be cheap but if he had addl damage besides just the ACL then his effectiveness may be compromised. Regardless, he wouldnt be considered a long term solution. Thomas also missed the season with an ACL injury and Finnegan Im not sure is still playing at a level that would be an upgrade over our first 3 corners.

Leonard, Griffin and Landry would all be upgrades at safety. Branch would be good competition for Spievey but might not be significantly better. Landry however will not be a free agent and just signed a big contract and Leonard's season ended because of a bad knee injury

Griffin and Landry are both barely acceptable in coverage and always look for that knockout blow, like delmas. Neither fits what we need in a more of a FS

http://www.footballsfuture.com/2012/fa/db.html

Grimes, Rogers, Finnegan, etc. not a great group, but some sure fire upgrades

Agree. They call our defense dirty, imagine if we signed Finnegan!

Didn't want to start a new thread for this. But, I figured I would just remind everyone that our penalty for Tampering is now a 6th round pick. I hope Scott Pioli dies chocking on it

one of the big problems with spievey has been his tackling. griffin is a much better player, including coverage.

True, but they won't look to a guy like griffin or Landry (who I thought was already extended) to replace amari. I can't see them giving up on him yet, which they would be doing by signing such a high priced safety. Get better man cover corners and the safeties will look 10x better.

Oops. I forgot to post this earlier:

1 Indianapolis 2-14 .539
2 St. Louis 2-14 .590
3 Minnesota 3-13 .559
4 Cleveland 4-12 .531
5 Tampa Bay 4-12 .551
6 Washington 5-11 .477
7 Jacksonville 5-11 .500
8/9F Miami 6-10 .504
8/9F Carolina 6-10 .504
10 Buffalo 6-10 .520
11/12F Kansas City 7-9 .512
11/12F Seattle 7-9 .512
13 Arizona 8-8 .469
14 Dallas 8-8 .473
15 Philadelphia 8-8 .488
16 NY Jets 8-8 .500
17 Cincinnati (from Oakland) 8-8 .504
18 San Diego 8-8 .516
19 Chicago 8-8 .527
20 Tennessee 9-7 .461
21P Denver 8-8 .520
22P Cincinnati 9-7 .492
23P NY Giants 9-7 .520
24P Houston 10-6 .453
25P Cleveland (from Atlanta) 10-6 .480
26P Detroit 10-6 .535
27P Baltimore 12-4 .477
28P Pittsburgh 12-4 .492
29P New England (from New Orleans) 13-3 .441
30P San Francisco 13-3 .449
31P New England 13-3 .449
32P Green Bay 15-1 .457

With today's loss and Houstons win we moved up. I'll be pulling for Atlanta to improve our spot tomorrow.

Giants could move us up 1 spot if they win also. And of course, if Denver can Tebow the Steelers also.

So do the Lions pick 22 or 23?

23... Per Bleacher Report

1. Indianapolis Colts - 2-14 (.539)
2. St. Louis Rams - 2-14 (.590)
3. Minnesota Vikings - 3-13 (.559)
4. Cleveland Browns - 4-12 (.531)
5. Tampa Bay Buccaneers - 4-12 (.551)
6. Washington Redskins - 5-11 (.477)
7. Jacksonville Jaguars - 5-11 (.500)
* 8/9. Carolina Panthers - 6-10 (.504)
* 8/9. Miami Dolphins - 6-10 (.504)
10. Buffalo Bills - 6-10 (.520)
* 11/12. Kansas City Chiefs - 7-9 (.512)
* 11/12. Seattle Seahawks - 7-9 (.512)
13. Arizona Cardinals - 8-8 (.469)
14. Dallas Cowboys - 8-8 (.473)
15. Philadelphia Eagles - 8-8 (.488)
16. New York Jets - 8-8 (.500)
17. Cincinnati Bengals (via Oakland Raiders) - 8-8 (.504)
18. San Diego Chargers - 8-8 (.516)
19. Chicago Bears - 8-8 (.527)
20. Tennessee Titans - 9-7 (.461)
21. Cincinnati Bengals - 9-7
22. Atlanta Falcons - 10-6
23. Detroit Lions - 10-6
24. Pittsburgh Steelers - 12-4

Seems odd that Atlanta picks ahead of us - they had the playoff tiebreaker over us, so got the 5th seed, but also have the draft tiebreaker over us and get a better pick? Seems like an odd system to me.

It's dependent on strength of schedule for draft, which Atlanta played an easier schedule, and in the playoffs it was the head-to-head tiebreak that determined Atlanta as the 5 seed. It does seem a little backward in this case, but that's just how it is.