Take out Jerez. It's a dump and the least accessible of all for the rest of Europe. Aragon is nice because it is easy driving distance for people from Madrid, Barcelona, Zaragoza, Bilbao/northern Spain, and it is about 3 hours south of the french border instead of the 14+ hours that Jerez is. Attendance figures might make it a hard track to drop, but it is by far the most rundown, and really the only place where the party gets out of control. The locals down there have too many days out in the hot sun and burn up their brains.