The problem w/ planning on getting Griffey is that you pretty much have to get 3 OF capable of playing full time, so that you are covered when (or if...) Junior goes down.
This causes your team to be OF heavy and then leaves a hole in your lineup somewhere so that when the 15th or whatever round rolls around and you are ready to pull the trigger on Griffey, you realize you only have one catcher, Michael Barrett (not totally bad value C, but he'll sit once or twice a week when Maddux is pitching...) or your RP are Foulke and Wickman (not that they're bad, but you'd probably be short a few saves...) and then, w/ a tear in your eye, you pick Junior anyway.
Then you panic after being down saves the first week, unload your worst 'spare' OF for some bullpen help and bam, Griffey goes down and you've got a waiver wire OF. Eeek!!