When I moved into a larger I house last year I ran into weak wireless signal issues in some rooms. I researched quite a bit and finally got an ASUS N66U wireless router. There are a few models. The models with the external antennas are known for having excellent signal strength, if you need it.
Asus routers cost more but also have several features, USB storage, network server, connect an Android phone for Internet access and much much more like VPN and cloud storage features. I just use it as a strong wireless router. I did play with various firmware versions but they are only necessary if you want to use some of the more exotic features or have specific device connectivity issues. Chances are your best bet is to just plug it in, run the setup and leave it be.
Since most TV's, AVR's, Blu ray players, DVR's and game consoles are built with really cheap and flaky wireless client cards, many AV devices struggle on WiIFi. So you can also consider buying two routers and using one as a wireless bridge. This is what I do. I have an older wireless router mounted behind my media cabinet. It connects over WiFi to my main ASUS router. And I use LAN cable connections from the bridge router to my TV, AVR, DVR, Blu-Ray and Xbox. The LAN cable connection to bridge router improves movie and media streaming performance significantly. The bridge router sustains a much more robust wireless signal quality than any of the cheap wireless cards built into nearly all AV devices. Our cable ISP has occasional bandwidth challenges on Friday and Saturday nights exactly when I want to watch movies on VUDU or Amazon. Weak WIFI connections only make the problem worse. So my video on demand buffering problems were greatly reduced after I setup the wireless bridge.