Manny M,
Here's a like to Jachymov's new website, which should answer many of your questions:
http://www.laznejachymov.cz/eng-title/
Here's the link to a YouTube video I did back in 2007:
http://www.youtube.com/watch?v=selFTx7kTJ4 (sorry for the poor quality)
At the moment I'm paying 59 Euros per day (this includes room, all meals, all treatments-including radon baths/ massage/medical consultation etc...
This is the summer rate for the category of hotel I'm in--the highest is 80 Euro a day for a room/treatments at the Radium Palace and the lowest is 47 Euro a day for room/treatments at the Astoria Hotel. Minumum is 12 nights, but I always do the recommended 3 weeks.
Winter rates and off season rates are much much lower (which is why I usually do this in the winter months!)
By the way: there is absolutely no difference in the quality of treatments nor in the quality of the food--those who pay top price at Radium Palace (which I have done) eat the same exact food as those who are staying in the lowest category of hotel and get the same treatments. Even the beds/bedding is pretty much the same. The only difference I see is that in the Radium Palace the setting was much more beautiful and in some of the lower category hotels (like the Astoria) you had to go out of your hotel to another facility for meals and treatments... Hope this helps
Luigi