Deciding on speedlights and wireless triggers?

Hi, I'm thinking on getting a speedlight for my photography. I have decided on Yongnuo YN-560iii as they are great speedlights for their price. My first quetion is whether I should buy only 1 speedlight or two as on Strobist.com and many other sites and such, I have seen that a double speedlight setup results in much more creative control, espcially for some of the shots I have in mind.

Second question is, can a Yongnuo RF-603 C1 flash work with a Nikon D3200 or are there some limitations? I know the cable release won't work, but doesn't the thing act as a wireless camera trigger? Please explain in depth.

Whther you buy one or two flashes depends on your budget - buy two if you can, if not, you can do a lot with single lights and a reflector.

I use YN560's and RF602 triggers, with a Nikon D100, D50 and a D300 (plus other makes as they get passed around at camera club).

I've not used RF602/603 triggers as camera shutter releases (I have a separate Hahnel remote release).