I have two lightweight and sensitive cabs that I can use with a range of heads. Or I can use one cab by itself if I need a smaller rig. For practice I have my laptop, USB guitarlink, Guitar Rig 3, USB foot controller and some earphones.
My experience with Guitar Rig software has bordered on the verge of an epiphany so I'm now thinking about taking those wedge speaker plans I had a few months back and turning them into a pair of active wedge cabs. Then all I'd need to do is show up to a gig with the laptop, footcontroller, USB link and a wedge.
Bass amp be damned!