Thanks all, I actually ended up getting the Unifi US-8-60W as I can live with the fewer ports, and can always get an additional switch down the line if need be. I'll still have a couple of PoE ports spare with this too, as I may add an IP camera at the front door at some stage.
Regarding the passive PoE comments, I read a thread on Ubiquiti's forum last night from a company rep saying they were phasing out passive PoE for their AP's in favour of 802.3af.