I don't know who I'd cast as Jango, but I'd prefer someone other than Morrison. And get the actor to practice sounding like Jason Wingreen. ESB Boba shouldn't be made to match a PT character -if they have to be the same then get the PT actor to imitate Wingreen. The kid playing Boba should match the adult in appearance as much as possible.

Somebody other than Christopher Lee as Dooku. Donald Sutherland?

Heath Ledger as Anakin. This is the big one.

I don't know if I'd keep McGregor, but I don't know who else I'd put in that role.

I'd get a more exceptional kid to play young Anakin. I don't know who.

Somebody other than Samuel L Jackson as Windu. I don't know who. Eamonn Walker? If Jackson has to be in it, give him another role. I don't know what role.

Get different directors. Del Toro? Peter Jackson? Anybody but Lucas.

Get a real actress to play Aayla Secura.

Oh, and somebody other than Pernilla August for Shmi, but I don't know who.