I am just starting to put together my gear rig and I am bombarded and overwhelmed with the number of different effects pedals that one could buy and the many different types and variations of the same type of pedal. My question is, if you have a limited budget (and floor space, :)) what pedals are a no brainer to have and which ones fall into the "that would be nice" category. Essentially, which pedals can I not live without?

Any help is greatly appreciated