The Daft thing is i have a 1500pt Tau army on the shelf, Commander with 2 Bodyguards, 2x10 Fire Warriors with Pulse Rifles, 6 man Steatlh team, 2x Railheads and 2x Piranhas. Kitted out it's 1500pts and when i used to play with them i enjoyed the fact that my Hammerheads could move 12", enter terrain and fire the Railgun. Reason for thinking about buying new stuff is that i just want to start over with them and i dont like repainting.
Handy thing is my local GW allows FW units, just have to own the book and have it with you.