Small business forum: Advice on Network Design (MLPPP, 15+ LAN Nodes, Gigabit-E)

Hey guys,

A little preface to the situation... I've currently got the entire infrastructure wireless using a single Buffalo WZR-HP-G450H as the router (connected to single ADSL WAN) and main 802.11N AP, from here I've got 3 additional WZR-HP-G450H's set to bridge mode with wired 10/100 cat5 nodes connected to them at various locations.

I've got a network PTZ camera connected to one of the bridges, and then feeding a constant video stream to a DVR in another building.

Needless to say, the network is saturated and bottle-necking somewhere -- I believe that to be a mixture of limitations from the wireless, and the fact that everything is overly complicated with all of the bridges.

LAN speed is slow, and local latency is a bit high (30-50ms); SPT enabled, no affect.

Current Network Diagram:
http://i532.photobucket.com/albums/ee328/thowle/Networking/HowleNetwork-Current021013_zps7dc890e5.png

Current Speed Test Results:
http://i532.photobucket.com/albums/ee328/thowle/Networking/Elwoh-SpeedTest-021813_zps09bb7b6b.png

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I'm in the process of having a bonded ADSL MLPPP setup allowed; I'm also going to revamp the entire network -- the plan is to get a Cisco Series 100 switch and a Cisco RV-042 MLPP capable router, and then run CAT6 to each node, connected to the gigabit switch. Using only wireless for devices such as phones, tablets, etc.

Proposed Network Diagram:
http://i532.photobucket.com/albums/ee328/thowle/Networking/HowleNetwork-MLPPPProposed2_zps58e36f68.png

Can you all provide any other advice on the situation and proposed network changes?

Thanks!