Slu,
I have an old Sonic Solution SD2000 card and a computer that can run it. My version for a Mac and it only runs on OS9. I can sell a turnkey system so it really doesn’t matter what system is it. This card has reverse telecine and segment based recoding.
The only advantage of any hardware encoder card is if you are coming from a tape (which is what you said you where doing) You don’t capture and then encode it all happens in one step. But the card is only for encoding for DVD authoring.
If you are interested contact me at onthecow (at) michaelangelodv (dot) com.
Once again Hardware encoder does not give you better than software but it gives you professional quality at real time from tape masters. I will let this go cheap, I just need to replace the computer with any intel mac, a used iMac intel would be fine.