WIFI is not just about pieces of Hardware, it is highly depended on Environmental variables.
The same Wireless Router can work well in one type of Environment and be a “Dud” in another. Most Environmental variables like, Apartment/House general layout, walls and their inner/outer structure, electrical Noises, furniture size and their placement, etc. cannot be (or it is very hard) controlled.
Thus, in many cases there is No Magic Wireless Router that can cover whatever One desires.
The best way is to lay a CAT6 cable to central locations in the house that is close to the destination Wireless client and install an Access Point, or Cable/DSL Router configured as an Access Points. Then connect it to the Main Router.
Using Access Points or Wireless Cable/DSL Routers as a Switch with an Access Point - http://www.ezlan.net/router_AP.html
You do not want/can not/hate/your client hate to lay Cables.Start with One affordable Wireless Router that can do WDS (the reason to start with WDS capable Router is that in case you need to add more Wireless WDS hardware the original Router has to support it).
Start with One affordable Wireless Router that can do WDS (the reason to start with WDS capable Router is that in case you need to add more Wireless WDS hardware the original Router has to support it). If you are lucky your environment is conducive to get covered with one Good Wireless Router, you are done.
Due to the added flexibility, it is a better solution to choose Routers that can work with the free 3rd party firmware DD-WRT
Using a Laptop loaded with Wirelessnetview, do a Wireless survey, http://majorgeeks.com/WirelessNetView_d6102.html
According to the signal strength reading, identify spots that have strong signal, and spots with weak or No signal.
Repeaters have to be put in places that have relatively strong signal and are in proximity of the "dead" areas.
How many WDS units are needed? It depends on your specific environment. It is a good idea to start with one additional unit, try it, and decide on the Next step according to the outcome.
Good Wireless Routers that can be flashed with DD-WRT and be configured as main Wireless Router, Access Point, or Repeater.
Money is Not an issue. Asus RT-N66U -RT-N66U
Best value for the price. Cisco E4200 refurb.
I want sub $100 and new (I am allergic to refurb.) Buffalo WZR-HP-AG300H
All the above are Dual Radio, Giga Switch, and has USB port for NAS.
They are very good with their stock firmware but also can be flashed with DD-WRT in case that special additional features are needed.
I want less expensive good Wireless and Giga, but I do not care about Dual Radio and NAS.
Buffalo WZR-HP-G300NH, currently $47 after Rebate.
I want to spend less and do not care about Giga, and NAS, but need good Wireless.
This is decent Wireless Router with Dual radio.
Cisco E2500 refurb. $35.