Join Date: Jun 2008
Location: Just outside Kitchener, Ontario
Bikes: Nishiki Continental, Bilenky custom travel tinker, home built winter bike based on Nashbar cross frrame
The OP indicated the bike started life as a seven speed - hence this would be a Visa. However, Gear To Go shows both the Visa and the Arriva as having 8 speeds as of '98. Separating Visa from Arriva may require more precise information than that photo.
You can find more information by doing a Google search for Santana Visa - you'll get back to the archives of this forum.
As for pricing, I would start with Mark Livingood's used tandem pricing tool (google search) using Santana Arriva as your "new equivalent". You will have to adjust for the bar-end vs. STI shifters (that's an upgrade or downgrade depending on your point of view), and the lack of suspension seat post for the stoker. Should you ever wish to tour with it, the bike in question appears to have braze-ons for front low-riders, while the current Arriva does not, as it comes with a carbon fork. Again an upgrade or downgrade, depending on point of view. Also be aware that with the lack of a rear rack, you will likely need to get one made by/for Santana, due to the extra wide spacing on the rear. Just points to note.
As a point of reference, I paid last summer $1300 for a '97 Santana Enduro Fusion - with a rack, drum brake, and pedals. STI shifters and rear tire needed replacing, as did the stoker seat post. You can compare components on Gear To Go's site, as the Enduro line no longer exists.