I am wanting better wifi coverage on the 2nd story of my home. Normally my children connect their smart phones and/or tablets, but the wifi is slow and spotty upstairs. The router is located downstairs, DLink N with cable ISP. I have heard varying opinions on range extenders and just using a 2nd router connected to the first using bridge mode. I am not biased to either solution, I am just looking for the solutions that give be a reliable and strong wifi signal upstairs. Thx in advance for any help. Btw the most recommended wifi extender in my circles has been the Netgear 600.