Hmm.
Current personal efx chain:
Guitar
> Tuner
> Wah [Crybaby 95Q]
> Phaser [EHX Nano Stone]
> OD2 [Sahasrara OD]
> Distortion [MUZA FD55]
> OD1 [Marshall GV-2]
> Harmoniser/Chorus [Boss PS-5]
> EQ [Boss GE-10]
> Vol Booster [EHX LPB-1]
> Delay [Boss DD3]
> Amp
if you notice, my phaser is before any of my drives... this is so that the effect is slightly more subtle compared to post-drive phasing. this is compared to the harmonser/chorus which if placed before any drives would sound like crap.