Are you kidding me.......Another flash head

[Sheiky]

I'm pretty sure there are support groups for compulsive flashers.

Strobist?

Certainly, but what kind?....According to the FBI dictionairy:
Strobist; a person who uses one or multiple flashunits off camera on a crimescene
Serial Flasher; a person who uses one or more flashunits in different non-related crimescenes
Mass Flasher; a person who uses one or more flashunits in different related crimescenes
Spreeflasher; a person who uses one or multiple flashunits on a randomly picked crimescene

It seems that the term strobist incorporates the other terms. They seem to be more detailed explainations of the specific types of strobist.
If I'd have to say so, I'd consider Bob to be a Mass Flasher. If you "google" on the terms(HINT: not advisable) you'll see that he's a lone wolf in a well represented pack. There are really a lot of strobists out there(quite disturbing thought I guess), but if you search for a more specific type of strobist you'll see that Mass Flashers and Spreeflashers are less common than Serial Flashers who are very well represented. I'm not sure if this is a good thing or not

On topic, though, you could get 3 YN560s for the price of one 430EX II, and since you're using manual anyway it seems like a good deal. 1/20,000 is their claim at 1/128 power.

And that...