I've got 4 remote AP2i's connected to a central AP2i, running on a WDS transparent bridge.  In total, have 10-12 computers running on the network, sharing one internet connection through the central AP2i.  I'm thinking about putting in a UTM firewall, like a Firebox x10, or a SonicWave unit.  Does anyone have experience with either of these, or have a better suggestion? 

 Thanks