If you want adventure in your 5 man you may want to check out GW2. With 33 dungeon paths and Fractals (a series of 9 mini dungeons which scales in difficulty to infinity), an untold amount of mini dungeons in the open world and never a ilvl requirement it offers an excellent alternative for the true dungeon crawler.
Be warned however that these dungeons aren't easy, especially when you are first learning them.