+1 on more Kegs. (I have 14 now)
1 5lb CO2 tank for fridge, 1 20lb for carbing and conditioning.
If you like variety, plan on many taps/regulators. I only have 2 and am planning on a 5 or 6 Tap Keezer.
Plan on setting up a Coat Check. You'll be getting a lot more friends over saying...