Nick, I would check your electrical codes for what you are allowed to run for wiring into what size box. I changed out 5 2 1/2" deep rectangualr boxes for 3" deep versions to be able to run 3 14/2 wires into them for use as power junction boxes as well as still being used as a switch box or receptacle.
The standard hexagonal light box is large enough to allow 3 14/2 wires, at least according the codes here.

I like to run power through my plug in receptacles first then to my light switch and finally up to the light, but doing this means I required the 3" deep boxes to extend this run to other places as I pull power from either the switch or a receptacle which means 3 14/2 wires in one small box. If I used the standard hexagonal light box as the junction I wouldn't have required the 3" deep switch boxes but doing this would have meant I needed to run power back to the switch on the white wire, something I generally don't like to do.

Jason
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