We currently use two out-of-warranty 3-COM 48-port switches (image: http://images.google.com/images?q=3C16476&biw=992&bih=393
) with model number 3C16476. One is slowly dying--meaning that every week, one of the ports stops working, requiring me to disconnect that cable to that failed switch port and reconnect it to the other (working) 3C16476. These are unmanaged switches. Our budget is (probably) less than $1500 USD total. Should we purchase managed or unmanaged switches for our roughly 100 LAN-connected devices? Also, should we consider 1000 Mbps for scalability?