The Potter area, while everyone loves to say how great it is, basically features only one new attraction, that being FJ. The other attractions in Potter are just repackages of rides you more than likely already experienced with no new significant differences, be warned.
As for places to eat, I highly recommend Mythos, its by far the place to eat at in the Universal parks.
My Universal/IoA favorites:
Spider-Man
The Mummy
Terminator
All the water rides in IoA
The attractions not up to par for me.
Jurassic Park- A LOT of the animatronics never work.
Dr. Doom's fearfall- Nothing but a Six Flags rip off.
Poseidan's Fury- The mold is terrible in this place and the final film is so completely washed out its hard to follow the action.
I also tend to avoid all of Suess's Landing, the place just screams visual headache.
I also recommend staying at one of the Deluxe hotels Universal offers. Staying there gives you the valuable front of the line perk that easily lets you do both parks in one day. Stay away from the second class value resort Universal is currently building, if you choose to stay there, you pay a premium price but do not get the same perk, the front of the line access, as the deluxe. It pays to pay at Universal.
Jimmy Thick- Hope you have a great time!!!