A phaser will most likely be my next pedal, probably the Boss PH-3 just go to with the rest of my board (5/7ths Boss) or maybe the MXR considering I'll be going for a Pink Floyd sound. Are there big differences between the Phase 90 and the Phase 100?
I have never found a definitive answer for that last question. I've heard that the 100 is a little more subtle than the 90, but as I have yet to actually FIND a Phase 100 in a brick-and-mortar store to test, I can neither agree nor disagree. I am, however, getting one in a few days, having just traded my Script Phase 90 Reissue w/LED, which is basically the 'Script' button on the EVH Phase 90. That pedal, by the way, is quite good, despite looking ridiculous. Anyway, I'll give my report on the Phase 100 after I receive it next week.
As for the Boss PH-3, I actually kind of like it. It's digital, if that matters to you, and it doesn't have the same impact as, say, a 1974 Phase 90, or a Maestro Phase Shifter, but it is an all-around good pedal, built well, uses the standard Boss power supply, and is, most importantly, easy to find and demo.