Looking to bridge the NVG589 - Options

I currently have a Netgear DGN2200, but sadly it doesn't have a WAN port so I'm looking to upgrade my router.  My main concerns are as follows:

1.  I need a guest network.  Since I plan to bridge the new router I'd want it to have a good guest network for company when they visit. The lack of a guest network and parental controls on the NVG589 is a huge oversight.

2.  I'd like to get something faster than my DGN2200 which is a 300 dual band router.  Perhaps AC technology, but I don't need a Nighthawk or something of that magnitude.  I currentl have about 15 - 20 devices connected to router (either wi-fi or LAN).

3.  I'd like to at least maintain my current internet speed.  I get roughly 43Mbps and I wouldn't want to jeopardize my WAN speed by merely bridging to a new router.

Your suggestions are appreciated.