Cisco SMB Hardware Recommendations

Hi all,

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EDIT: Not necessarily from their SMB line, for a company of let's say 100 users.

Currently operate 2 locations, each with 1x SG350X-48MP doing DHCP. One location is an office which has an RV345 above the switch, the other location has an 892FSP above the switch. I really like the SG350x and haven't had any issues, other than one dying the other day...not sure what happened but that's for another post. Anyhow, soon the second (hq) building will be completed and the locations will be combining into a 2 building campus with fiber between. I will move the 892fsp to the main building as well as installing about 160-170 ports, was planning on doing this with 4 stacked SG350X-48MP switches. However, I believe I would need all the SFP+ ports to stack them. Once the two buildings are connected there will be around 50 computing users between the two. 80 or so employees total with associated personal wireless devices.

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We are also using WAP581 access points. Also super happy with them, blazing fast. However, the Single Point Setup functionality only supports I believe up to 16 WAPs in a cluster. We will have a third building up in a year or so and will definitely be above 16 so I don't want to switch then, I'd rather switch now, since we may end up going above 16 anyways with just this second building.

1. What would be the best way to connect fiber between the two buildings - switch to 4 switch stack?
2. Would you recommend a different Cisco switch that is 48 Ports of at least PoE+ in the same price range (~$1700)?
3. What Cisco WAP would you recommend? The WAP581 is only about $320, don't want to go too far above that.

TIA.