Conrado, Morbyd,
Solution is go for Space Opening in early June, then Opening of We Love Sundays mid-June, go in August (first or second week) when Ibiza is at its peak and is barely bareable and then go for the Space/DC-10 closing parties!
Only reservation I would have is Closing Parties can be depressing - you have to wait a long time before you'll be back - whereas Openings are a thrill - an appetizer to your summer holidays as you know you will be returning for a longer time in a couple of weeks.