Old school, but worth mentioning. . .
Ibanez EPP-400: http://www.harmonycentral.com/products/117927
I found this unit to be extremely versatile. Can be controlled via Ibanez foot controller or MIDI controller.
Front panel allows for programming of the order of efx. E.g., Mutron III -> Octaver -> Distortion
or any order of the up to 5 controlled units you wish.
This is in contrast to GCX which has more loops but even it won't let you 'program' the order in which they fall.
Akai MB76 Programmable Mix Bay, Guitar, EFX, Router. Recently someone got one for $53
I guess there is Rockman Midi Octopus too?