Some transports you might consider buying used are the Theta Pearl and Theta Data Basic I and II. The Theta Data Basics use the discontinued Phillips CDM-9 mechanism, so if you ever need to have it serviced it might be a problem. On the other hand, the Pearl uses the still available Pioneer mechanism. Also, look into the Sonic Frontiers SFT-1 and Audio Alchemy DDS Pro.
These have all been discontinued, but seem to have quite a following. All units can be found used for between $400 and $1100.
These have all been discontinued, but seem to have quite a following. All units can be found used for between $400 and $1100.