They sure do...

http://www.sherwoodusa.com/2002products/2002HTML/A958.html

What I can see is that in 1-2 years, there will be a lot of interesting separates available.

What I also read was that a Denon 3802 as a pre-pro is also very good when matched with the 770. The 770 takes care of the flat sound of the 3802's amp section. That could be an affordable pre-pro with all the goodies while waiting for a better pre-pro.