I suggest you keep a 7500
The 7500 will work with the linksys
As for which has better wifi range testing will provide the best answer
said by Steelhumm:
I also have Ethernet running to 4 rooms in the house, could I somehow extend the wireless range by using any of these products in combination?
The 7500 or linksys can be reconfigured to work like a access point for the network