The TopGlobal is bricked. Couldn't get it to load DD-WRT.
Installed DD-WRT mini on the Linksys, then immediately updated it to Standard. Configured everything, overclocked to 250MHz, set QoS based on IP/MAC addresses for the VoIP and other services and it's working fine as far as I have tested.
It seems I will be keeping the Linksys then.