This isn't a Super Bowl team yet. There are definitely holes to fill. More may crop up as the season progresses.
If the team goes FS, I like Chris Hope from Pittsburgh. I have a sneaking suspicion that the team doesn't really value the position though. Wouldn't be at all surprised to see the team go to camp with Pile/Davis/Beriault and maybe a later round draft pick.
The value in FA this year is at OL IMO. Steve Hutchinson, Jeff Backus and LeCharles Bentley are all FAs. What are the odds they make it to FA? Probably not great. However, if the team decides not to keep LA around (and he does have a pretty big roster bonus coming up), G becomes an immediate priority.
There are some decent kickers available, but I hate paying kickers.
I think LB, WR, OL will probably be the priorities. I'd also take a look at TE, FB, CB and NT/DT although they aren't as pressing.
Some names in FA I like:
Ma'ake Kemoeatu
Larry Tripplett
Chris Hope
LeCharles Bentley
Steve Hutchinson
Verron Haynes
Resign Gurode and Campbell.