For soe reason I'm having trouble finding the 'premium' windcover. So I suggest this:
The traditional cover in the LARGE size. On that hookah, a large should fit over any bowl you decide to use. Even the big, tall phunnels.
Diffusers and charcoal holders are great, but I'd suggest getting a Nammor hose first.
Diffusers make your rig quiet for when you're watching tv and such, but whether they enhance the flavor or anything else is still up for debate. Coal carriers are darn handy, I use the basket style.