In what sequence should I place the following guitar effects on my pedal board?

Question:In what order should these be placed in the chain?
Digitech RP150 Modeling guitar Processor
Boss RC-20XL Loop Station
BOSS TU-2 Chromatic Tuner
Behringer UC100 Ultra Chorus

Best Answer - Chosen by Asker: In what order should these be placed in the chain?
Digitech RP150 Modeling guitar Processor
Boss RC-20XL Loop Station
BOSS TU-2 Chromatic Tuner
Behringer UC100 Ultra Chorus

Here is what I would do:

1) Tuner - you don't want any effects on the signal while you're trying to tune.
2) Modeling processor - this is your main "tone" generator, in other words, how you choose what kind of basic sound you want - what kind of amp/cabinet/distortion.
3) Ultra Chorus - this would be used sparingly, but you want the effect to be on top of the basic tone you've already made.
4) Last is the loop station. Once you've made your "sound", now you can capture phrases for looping and creating a bed upon which to layer other sounds, etc.

The pedal that has the most distortion goes last.