In reply to sparbus:
Like others, a 60m rope is more than fine for almost all climbs in Costa Blanca.
And generally speaking, longer ropes are only needed on some extension climbs, at reasonably high grades.
But If you already have ropes you plan on climbing at home, and your only looking for a rope to be used on sport climbing (trips?). Getting a 70m rope might be a good bet. When it starts to show wear, you can chop off 5m at each end and still a 60m rope.