get a powermac g4 - the best ones come with dvd-burners, and all the powermacs come with firewire inputs. you can use imovie (which coems with the comp) or get premiere or final cut pro for much higher level of editing. you can also buy an analog capture card to import analog footage, which you can edit too, and export to digital if you want. if you really want to make dvds without buyin a bunch of hardware, just get a real good mpeg encoder, and you can incode a dvd and burn it on a cd - cds can hold like 20 min or so of DVD movies, so that probly enough unless your doin real long shit. just make sure you have a good dvd player, cause some cheaper players, and ps2 wont play burned disks. have phun!
HMFIC of MammothPunks.com