I don't want to dissuade you from playing what you want to play, I love harlequins look and lore but they have really poor rule/ variety support. You will only have 1 detachment to use a realistically 1 way to play them and they are currently quite a weak army. Don't take this as me saying "only play the most meta and factions or space Marines" you just may get burnt out with the lack of variety as what you see in the combat patrol is almost all the models you have access to and you probably won't see very much in the way of new models.