Power Plus 3.5 Standard FootWarmers
A better option is to get a pair of Hotronic FootWarmers (www.hotronic.com). These units have a heated footbed that slides into your shoes or waders, with heating wires embedded in the footbeds. Another wire extends to a battery pack that you hang off the waders or your belt. It's similar to the Cabela's setup, yet you'll find the FootWarmers are considerably more robust. Plus they have rechargeable batteries. Four heat settings give you anything from two to 18 hours of hot feet, which is I imagine is long enough to be standing in a cold stream! They cost $185 a pair, but maybe would be a good investment for you given your medication and desire to be angling in all weathers.
Hope that helps. Good fishing!
For the right gear to land the big one, read "The Fin Crowd" from the August '03 issue of Outside.