I my learnings with 'woulda, coulda, shoulda', I would agree with UB and make it possible to run cables inside and out from top floor to basement. I would also run CAT5 and such like Nakman said.
The grounding suggestion is also great and necessary. I would recommend flat copper sheet 1" wide in leiu of the 8 ga wire because it will allow better results due to electricity flowing on the surface of copper rather that the entire body. More surface area, more efficiency and better grounding characteristics. I would also recommend 220 30A service along with the 110 20A service devoted to the HAM shack. The reason for the 220 is for the amplifiers.