+1 for Mikrotik devices. I've used them extensively, and they really are amazing for the price. Basically you choose the hardware based on what you want to do (e.g. wireless, number of ports, SFP etc.), and the software is the same regardless. You can configure them to do *anything* - and I really do mean anything - access point, router, firewall, internet via 4G dongle... right through to ISP-grade features such as MPLS and BGP routing. In my opinion, they blow almost everything out of the water.
