It's hard to tell from your description if you shot on different video formats or if you used different cameras that all recorded on miniDV tape. If you shot everything on miniDV tape, you can use that format to edit everything in Premiere. Simply select the PAL or NTSC option in Premiere.
Ben – before you speak for all, please ask. I have used Premiere, Edius, Avid, FCP, Speed Razor, Edit and too many other programs to edit docs.