expect anywhere from $5k to $10k ($5k is v.cheap no wonder it sold quick)
make sure its genuine and original (eg not deseamed or flipfronted) before paying top dollar... but even a replica with all the proper bits can be worth decent money since some of the unique S parts (motor, 7.5" discs, rh tank, heater, twin carbs with the air-filter box etc) are worth big bucks these days on their own.
I was going to make my deluxe into a replica S but I worked out it was going to cost more to restore the deluxe and buy the bits i needed than to just buy a proper s already done (though i did get a fairly good deal on it). the front half of the deluxe was sold on saturday to someone who is planning to use it as a garden ornament

thats not how i though it would end up