I've got an Actiontec Telus router as well. They're pretty limited as far as configuration options go, but see if you can change the channel it's running on (there should be 12). Sometimes you can noticeably decrease 2.4Ghz interference issues by running on another channel. Also make sure you're using 40Mhz channel width, not 20Mhz (I'm pretty sure the Actiontec supports this setting).
If your devices support 5Ghz, absolutely get a dual band router, even a cheap one. I've got a pretty entry level dual band D-Link that, without any tweaking, could hit sustained throughputs of around 90Mbps (I couldn't get more than 10-12Mbps with the Actiontec*). 90Mbps is way more than enough for HD streaming. (Note this is throughput, not what speed Windows reports that you've connected at).
*Technically, 10-12Mbps is more than enough for HD streaming as well but if it dips (and it did, often, for me) you'll get stuttering. Depending on your media client software, you can increase the buffer size as well which can help smooth things over during dips.
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