Best use of resources

Any advice on the following would be appreciated…

100Mbps Backhaul > RB1000 > 6 x 60 Degree 5GHz APs (RB433AH/R5H)

Each AP will have approx. 50 wireless MT/UBNT clients.
PPPoE will be used for client authentication and WMM will be active.
Should the RB1000 be used as a central PPPoE server for all 6 APs as well as routing and traffic management?
Or should each AP run its own PPPoE server?

i think i would use the rb1000 as a radius server if you arnt using somthing different for that and run ppoe servers on each ap that auth to the rb1000, routing will be running on all aps and you can use rip or ospf to make it simpler. just my 10cents