I usually go end Aug / beg of Sept or 1st 2 weeks in Sept. I like it best then, also been in May, June, mid-August and October. It's less busy but seems to be cheaper and the weather is easier to bear (well not the storms though!)
I am going with my mum 28/8 - 3/9 but need to meet up with people to go clubbing - give us a shout people!