cel4145
Headphoneus Supremus
Would those be good to replace with martinlogan possibly?
If you have something like Klipsch Quintets for your surrounds, then yes. The Martin Logans will be some improvement.
http://www.klipsch.com/quintet
However, I suspect that might be the poorest way to improve your home theater setup for your money if you are thinking of spending $2000 on speakers.
Which Klipsch bookshelves do you have in the front? The model number should be on the back. And probably on the back of your center speaker, too, so we know what you are working with.
What is the make/model # of your sub? Should be on the front and/or back.
How big is your room? And about how far away do you sit from your speakers?