I have a Signature 2.0 Pre and PA5800 Amplifier.
The Sig is a great pre. It has some nice customization features that weren't really norm back when this was a new product. I bought it online direct from Harmon International's website for $500 about a year ago. The remote is kinda awkward, but its typical H/K bigness that they had at the time.
You can rename all the inputs to whatever you want, plus all the inputs/outputs are assignable. Just plug into whatever free inputs and use the menu to assign to the correct name. A cool feature is that it starts at a preset volume everytime, which is nice because you never get surprised.
Since its old it only supports DD and DTS 5.1, as well as everything under those.
The only real complaint I have about this unit is that since it uses a microcontroller for pretty much everything, you can hear slight clicks whenever changing the volume, changing inputs, or making a menu selection. But it doesn't affect anything during normal playback.
For $500 its pretty nice. However you may be able to find recievers that have built in Pre-amp outputs that are only a couple years old, that will have way more features. For $800 new you can get
Outlaws HT Preamp, which has gotten good reviews from what I've seen.
Also one thing on this <Signature 2.0> pre is expansion. It only has 2 coax digital inputs and 4 optical. It also only has 2 S-Video (no component switching). So you can run out of inputs with newer electronics pretty fast. Even with just an X-Box, DVD, and Laserdisc player you run out of inputs fast.
It is beautifull though, only a couple buttons and a big volume knob populate the front, along with the pretty blue display.