@ xlEternitylx - I've started taking 2

I went in depth on the night spinner here:
http://www.dakkadakka.com/dakkaforum/posts/list/60/388442.page
@Makhoy - Banshees really ahve no real use against Tau, sinc the only thing that has decent armor is Crisis suits or Broadsides, both or which don't come in mass numbers.
For anti-tau you need:
- Wave Serpents: Suddenly their rail guns become a non-melta melta and that coupled with their hit ratios neuters them a bit.
- Scatter Lasers: Side Armor shots on the Devilfish in volume to counterbalance their cover saves and vomue wounds against crisis suits.
- Fire Dragons: To pop those hammerheads or broadsides.
- Volume Fire or Large Blasts: To clean up.
Do not bother with foot units vs them unless it's jetbikes because the Tau will just out range you. Those 5
DA without a Serpent will only be a liability.