Ok my summer setup is below before I moved it to an old cooler. I say Summer since I have high ground water temps. Theses high temps were what led me to use this convoluted setup below before moving to a submersible fountain/pond pump from Harbor Freight.
It consisted of my old 1/4" extract days immersion chiller feed by my garden hose prior to entering my Chillhog Super 20 Plate Chiller and the output from the chiller went into a bucket with PBW to clean up the brew gear. The wort entered the plate chiller from the pump and then went through the short coil (3/8") setup as a post chiller before going into the carboy. All of this was submerged in ice water in that tub. It was a real pain and I could only get temps into the upper 60's into the carboy during the summer even with the output of the wort throttled way down.
After messing with this crap for a few brews I got the submersible pump and recirculate ice water through the plate chiller only. I gave the old immersion chiller to a friend and keep the small post chiller coil on a shelf in case of some issue with the plate chiller. I go through 10+lbs of ice on a brew day but I can easily get output temps in the 50's straight out of the kettle at flameout. Now I can have my Plate chiller mounted to the brew stand and just sit the cooler of ice with the pump in it on the ground next to it. Could not be easier.