Isolation Transformers

I've been considering isolating my digital gear from the rest of my system. I've read some good information in the archives and want to know if anyne has direct experience with the MGE or Tripp-Lite units. Tripp-Lite offers a hospital grade and a base model, both appear to be hardwired. Not sure what the differences are other than cost. MDE has a hardwired and cordless model. I like the idea of using my own power cord, but not sure this would make a big difference. I'm leaning towards a 1KVA version. Any advice would be appreciated.

BTW - I don't and cannot have dedicated lines. I'm using a North Star transport and Monarchy M24 DAC at the moment.