Its worth would depend on a number of factors:
1. As has already been mentioned, finding a well specced Beach is almost impossible. They are rarer than rocking horse $#!t. If you have one then don't under sell it.
2. How desperate are you to sell it as now isn't the best time of year? Can you wait until the spring has sprung when values usually rise?
4. Is it in tip top condition? Any knocks and scrapes will reduce both value and interest. Get those fixed first.
5. Does it have a full VW service history?
6. Does it have any Extended Factory Warranty remaining?
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If you present the vehicle well and are prepared to wait then selling privately will secure a top return. IMO, only use WBAC and the likes to get a rough price guide of a basic Beaches value or if you need to get rid quickly. Even then beware. Even if you have described the vehicle accurately, my experience is that they will keep looking until they find some minor excuse to knock the quoted price down. In my case WBAC wanted to knock £200 off for a paint chip that was barely visible to the naked eye! That vehicle was mint but not a Cali.
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Finally, a good set of photos showing all the various options can sell a vehicle.