*sigh* all the stealth suit hate ):
I actualy field a sqaud of stealth suits most of the time. They are great anti-infantry troops that are pretty much immune to long range (beyond 30") fire. Artillery fire... bah.. even IF template fire can see you, it scatters a extra die. Any fool who comes too close to the stealth suits, 2 markerlight drones for a
BS 5 burst cannon spam

Works wonders against orks and nids i tell ya ;p
And i recommend a battleforce. Really good set of troops
imo. Lots of types, compaired to the really plain ones (
SMs and
SW's come to mind). Just note you DO lack heavy support choices with your idea of 2 battleforces and a single XV8 (in which heavy support is the tau's strong point in the whole army).