Don't get the drop in and I say that for a couple of reasons:
1. It's a waste of money if you are going to not use it when the new CAI goes on. Save that money for the CAI!
2. Open or closed is really an aesthetic choice although the closed systems (like Volant) do isolate intake air from the engine compartment. But, realize they all pretty much flow the same CFM.
I have the 54-10381 Stage 1 AFE on my truck and it works a lot better than the K&N drop in I had.