Which Untangle Appliance to Replace Netgear Prosafe SVX5308

I'm thinking of replacing my Netgear Prosafe SVX5308 with an untangle appliance, but I'm not sure which one of the untangle appliances is similar performance wise to the prosafe router. I realize to some extent these two appliances are apples and oranges, but mostly I'm looking for an untangle box that would give me close to the same basic router performance.

Thanks