When is your spring break? Canadian universities' year end mid-end April, so there is no spring break.
The clubbing season goes from June - September, so if you are going for primarily a clubbing holiday, I would wait until you have time to go in the summer.
Pacha is open year round, but not like it is during the clubbing season. I hear Ibiza is lovely to visit the rest of the year for other resons, but you won't get a clubbing holiday out of it if you go before June (and only some of the nights will open up in June)