While you have a distortion box listed, fuzz boxes are another beast. There are so many options from the historical designs, from the tone shape modified designs, to just the modifications to the original designs. If you liked the sounds the Smashing Pumpkins got then you will probably want to look into a fuzz box. Modulation effects are always fun, but are really more of a personal issue if you like the sound. Reverb, Flanger, Phase shift, Chorus, tremolo, and vibrato. There is also a lot of designs of these out there. Depending on if you are a bucket brigade disciple or not the price can vary. Compressors are always useful. You can hear the difference immediately with just a small addition of compression. You can over do it too if you want to. Then there are the more odd pedals like Feedback loops, bit crushers, lo fi's, ring modulators, and crossover distortions. These tend to be not used nearly as much as the sound is rather distinct, and not really standard. Because they are not built in high volume, they also tend to be pricy.
My biggest concern with some of the pedals is the price/use ratio. I cannot justify paying a lot for a pedal that has limited applications. But a Fuzz pedal I like I can pay for because I like the sound for almost everything. This personal moral pedal price dilemma is really what got me into building my own pedals.
I know I have missed a number of pedals in the psuedo list above, but oh well. I also have to say I am not to keen on the all in one box thing. I tend to spend way to much time futzing with the unit. Then I don't play much. Individual pedals are easier to mess with the knobs and go for me. It is an unholy mess of cords and such, but I tend not to piss off my musician pals if I spend less time mucking with the boxes. Some day I'll make a pedal board and clean a lot of the mess up, someday...
Patrick
Patrick