Welcome to the fold. I would suggest keeping an Avid around until you’re REALLY comfortable with Final Cut – especially for those jobs where time is critical and clients are sitting in the room.
Some quick suggestions:
1) get either a bigger Wacom, or a “widescreen” wacom. Two 23″ screens or a 30″ is a lot of real estate
2) get a Kona 3 pci card. It’s pretty much the premier warmachine. It can do everything, all the time, and does it well without any complaints. Track proven. the IO-HD is still a little new…
3) drives. If you’re not doing Uncompressed HD – then buy some G-Raid2 firewire drives. They’ll do uncompressed SD no problem, and ProRes will serve most people HD needs for years to come. A SAN solution is a whole different email. Search around the forums first.
4) Get the 10UK. They’re the newer model. Can’t go wrong with the Panny’s. They do a great job with standard def signals too