I've played with this kind of thing a little before - speccing speakers for a mates wedding (or at least 'asking my mates who run major fesitval stages what they'd advise, then renting it from Stage Electrics')
Ended up with 2xRCF TT22A and 2xRCF SRS1500 which was perfect for the space, and sounded pretty nice, and I really enjoyed the experience - hence wanting my own rig.