While going down he road, can you tug on door to make it a bit tighter, and a bit more quiet? If yes, I'd start with door seals, but first I'd wipe them down, spray a silicon spray on rag, and wipe it down entirely. I would then do the same with window seals, roll window down, wet rag, clean seals really good (maybe wrap a butter knife with rag, slide and clean any dirt from channel, then the other rag to lubricate seals.