The critical wiring has started.

Encoders, servos,limit switches.
1) Is it ok to run shielded wire from the Gecko drives to the servo motors for the power? If so, should the shielding be grounded at the Gecko end?
2) Will regular wiring be ok from the bridge rectifier to the Geckos? I have them twisted in pairs to maybe cut down on noise or (EMF?

). They are close to each other.
3)When putting the power wires and encoder wires in separate conduit. Is it ok to use metal flex conduit that isn't fluid sealed?
4) My encoders are the AMT-102 type from Digi-ikey.
http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=AMT102-VWhat setting should I use for starting out? Here are the switch settings and different resolutions.
http://products.cui.com/CUI_AMT102-V_Dip_Switch_Settings.pdf?fileID=3816Everyone says to use differential encoders for less noise. This particular encoder doesn't have A, A-, B, B-, etc. But, this is the encoder that Mariss Fremanis recommended for the Geckos.
5) On grounding the shielding for all of these shielded wires: They have a pigtail soldered to the shielding at the end connected to the motherboard or breakout board. Should all of these be daisy chained together and then grounded to the cabinet?
Sorry for all of the questions in one post. These are some things that i have been unsure about. After searching and reading didn't clear this up, I asked here.
With these answers I'll fell more confident and a lot of other things will make more sense.
Thanks a lot,
JAckal