Just using the supplied adaptor. I was planning to buy an EdgeRouter lite 3 but now thinking perhaps I should go with the EdgeRouter POE (5 Port). As I'm planning to put up at least 2 of the 3 APs I bought. I'm not really up on PoE standards though so will need to do some research.
The biggest downfall with the PoE version of the Edgerouter is the fact bridges are not accelerated and you lose performance meaning you'll have to either use VLAN trickery or other networks for the PoE ports to maintain top speed. This is why I think the ERL + a small PoE switch is a better option which is also cheaper.
Any PoE switch will do here.