I powered our 12 APs in two blocks of 6 off two SG300-10MP switches. Works a treat.
I don't think you'll need to wire all 90 copper links back to the switch once you've got your wifi up and running.
Can someone explain Stackable?
If i have 3 switches and a router the router connects to the first switch, this switch connects to the next and then the 2nd to the 3rd, whats that called via the normal ports?
That's called trunking.
...And stacking is where stackable switches are connected over a dedicated interface (Gig, 10GbE or proprietary datalink) to provide a unified system. So, rather than having multiple switches to manage separate it they are managed as one large switch essentially. The use of the stacking interface between them also preserves all of the ports for use on the network rather than trunking several ports to connect standalone switches. Stacking is only really relevant where you need to use a large number of switches in the same network cabinet or need enough ports to fill more than one data cabinet in the same building. Generally, it is going to be much cheaper to use a large modular chassis switch rather than stacking a large number of 24-48 port switches together (although cable management is easier with stackable switches).
Stackable do allow for better cable management. As they can be interleave panels and switches.