Buying a used Pre-amp...Advice needed


I'm looking to buy a used pre-amp with a good sound. Here is my stiuation. I've been buying several DACs to compare them with my existing system and really amazed by how differences in sound each DAC makes. But I discovered that my Chiro C-802 DTS Processor do not have analog pass-through. That's mean, it convert analog to digital and then convert the signal back to analog again(Correct me if I'm wrong). So, while waiting for the Processor to be modified to get analog by-pass, I want to get a good pre-amp to listen to the music.

Now I need your suggestion for a used, good sounded pre-amp. It should not be an expensive one (around $400 used). Thanks in advance for your help.
supakit
I was lucky to find a Audible illusions Mobulus 2D for $450
used. It took looking for several weeks to find it. I was prepaired to payup to $800 for the mobulus tube preamp. A friend has a Mobulus 3 and told me he loved it and I agree with him. The new 3A's go for $2500 and used for $1100-1300.
keep looking and a bargain will come along. Just be sure your ready to jump when it does. I knew what I wanted and wated for it to come along. this way I won't be looking to upgrade anytime soon. RG Knaak
Old reliable Conrad Johnsons are fairly easy to find in your price range. If it's just a tide you over kinda thing it should suffice.

chas
I bought a preminence one for about that--maybe a little less. It's passive, so there are some considerations there--passive won't work in all systems (there is a thread on passive vs active pre amps). For the money, I've been very happy with it.