You can take 2 or 3 nanokontrols if you want

Someone has created a nice template to print on a sticker for the NanoKontrol 2

http://www.varranger.com/images/vANanoK2.JPG

Each can control 35 vArranger buttons and 16 volumes !

I also have many little controllers with tons of buttons

I personally prefer compact and lightweight setup, but No problem to go for a big 88 keys too etc...