You could get the Actiontec Extender but I think you could get better bang for you buck with something like the Asus RT-N56U. You do need to wire an ethernet cord which may be a pain but you'll be upgrade ready later if you end up wanting to do any home networking, get another type of router, switch from Verizon, ect.
The main thing you want to do is make sure the wifi channels are spaced out to prevent interference. Also,these instructions are good for if you want the computers on the "2 networks" to be able to talk to each other.