Merle,
I don't own the Khartago, but I've heard them. They are very nice amps.
The Stratos is just a tad nicer IMO. The more you spend with Odyssey the nicer the stuff, as it should be.
They are still being made, the problem is Klaus is not the most knowlageable Internet guy and doesn't update his webpage very often.
You should call him at 317-299-5578 to discuss the compatibility of your equipment with his.