First thing I would suggest is reconnecting the Apex directly to the router again - if the slow response goes away, then the Powerline gizmos are likely having issues.
If you decide to go wireless and If you like the Apple AirPorts, then the AirPort Express is the logical choice. Otherwise, I suggest the Netgear WNCE2001. Best Buy carries them, as do some Walmarts.
Keep in mind that you cannot do an Apex firmware upgrade when using a wireless bridge or gaming adapter.
If you decide to go wireless and If you like the Apple AirPorts, then the AirPort Express is the logical choice. Otherwise, I suggest the Netgear WNCE2001. Best Buy carries them, as do some Walmarts.
Keep in mind that you cannot do an Apex firmware upgrade when using a wireless bridge or gaming adapter.