Kamando -
A new Stelling Sunflower will go for $3225 with the Tony pass rim. This instrument you saw sounds to be similar. A used instrument will obviously go for whatever the market demands. A word of warning, make sure you know how to inspect an instrument for any visible signs of damage, fret wear, string buzzing ect. Some instruments have been repaired and may not be noticeable without careful inspection or knowledge of the instrument. Buyer Beware.
I recently had a student bring a similar banjo to me (thinking he got a great deal) $600+ additional dollars later, he was able to have it repaired.
All things considering, if this is the same instrument at $1999, your only saving a couple hundred for a used Stelling without the old wood rim (especially if you intend to put in the $500 old wood rim and ship it insured). For a Stelling, you need to send that back to Geoff Stelling himself. To do otherwise, is not very wise.
Hope this helps.
Dave