I strongly recommend the following:
-Whiteboard, definitely smart to put your ideas into a visual interpretation for others to grasp.
-1 to 2 flatscreen TVs, definitely good for monitoring software such as WildMetrix or a network management activity tracker. Something that can be broadcasted that most of the department will be looking at, or that is a must need basis of checking out.
-Plenty of room to grow, our department soon has to move completely to another area in the building because we expanded really quickly. We know have 3 more programmers and 2 more techs then we originally had and we plan on hiring more but do not have space.
-Storage area, DEFINITELY a good idea for incoming computers that have yet to be installed. Trust me on this one, you need somewhere to store all the equipment you arent using. A small closet won't do but a small room should suffice. We had a BAD time trying to organize all the boxes of equipment that we didn't have storage for, but when we got our storage room (about 15 sqft is ours), we made it a day long project to move and sort all the equipment. Make sure you LOCK that storage room. The storage room also keeps away pesky people that ask for things. You can just state that you do not have the equipment they need at the moment. Some equipment is on hold and if they see it sitting there they will ask for it.
-A big network drive, An external wireless network (for testing external users), and a door that LOCKS.