I run my warbands normal mostly for upping the activations. I actually don't use big and 'uge formations a lot at all, one or two in the whole army. Leave it to the Steel Legion to have the expensive formations. This thread did make me want to try with this list though:
WARBAND ('UGE) [550]
6 Nobz, 18 Boyz, 6 Grotz, 2 Killa Kan
WARBAND ('UGE) [500]
6 Nobz, 18 Boyz, 6 Grotz
KULT OF SPEED [200]
8 Warbuggy
KULT OF SPEED [200]
8 Warbuggy
STORMBOYZ WARHORDE [150]
6 Stormboyz
STORMBOYZ WARHORDE [150]
6 Stormboyz
FIGHTA SKWADRON [150]
3 Fighta Bomba
FIGHTA SKWADRON [150]
3 Fighta Bomba
FIGHTA SKWADRON [300]
6 Fighta Bomba
GARGANT [650]
You know, just for kicks.

Set up the 'uge formations in garrison and see what my opponent does to counter them.