You can start moving to 4K

You can start moving to 4K now with each piece of equipment you buy. Or you can kick yourself later when you have to move to 4K and need to buy everything at once to get there.
Your Drone with 4k will do 1080 also. Anyway most of them do. If your looking at the Phantom then yes it will do 4k and 1080 for the Pro. But it will not do SD. (Bummer) Unless you buy the cheaper one then it only does the 1080.
Hope this helps.
Michael