I photograph my 7 month old mostly... so I use what I have. Two 580ex iis, the yongnuo 622 c's, one umbrella stands and one diffuser, though I'll be fixing that to two soon. I want a 72" umbrella but I think I'll wait a little bit on that.
The yongnuo cost 120ish and allow for ettl and power adjustment through the camera. I use mkii two current tripods.. so my"studio" is make shift, but it folds up nicely because I use a family room... so being able to reduce all of the stuff is key.
I have a few small complaints about my setup, but they are mostly related to me hitting a button and changing the channels of the transceivers. So human error.