There are actually 3 TSD packages:
#1 is to machine your own slide ($200).
Add the RMR of your choice (RDS or Tritium), suppressor sight(s) and refinish (all extra cost options). About $900 depending on which sight you choose.
#2 is a new Lone Wolf slide machined to accept an RMR.
The Tritium RMR, slide internals (except barrel and recoil assembly), suppressor sights and refinish included in price $1100).
#3 is the above package with the battery powered RMR.
Barrel and recoil system is available as an extra charge for #2 and #3.
From my research, the tritium/fiber optic RMR generally runs $100-150 cheaper than the battery-powered model.
The red dot on a defensive pistol was previously not done because there were not sights well suited to it.
Kelly McCann/Jim Grover has ran the Dr Optic (similar to the Jpoint on mine) on his combat Glock 19 for a while.
Now with small, battery free, sights like the RMR it is starting to gain popularity.
Again, there are two models of RMR: battery and trit/fiber optic. Gabe recommends the battery model for various reasons detailed in several of his articles on his site.
I seem to recall reading a magazine article about this recently, I don't recall with publication it was. Photograph's accompanying the article showed the gun in a holster, and in various usage situations. Seems like a pretty neat idea in some ways.
May/June 2010 issue of American Hnadgunner IIRC.