A:Answer Your problem is either in placement, or interference from your neighbors networks.
If you have to have the thing on one end of your condo, get this router and then ask the Best Buy nerd people to show you a compatible DIRECTIONAL Antena.
All routers come with omnidirectional antenna, which is ot what you need (based on your description), don't fight with neighbors over strength of signal. Focus your signal and win in your space, it's better that way.