DO NOT I repeat DO NOT get an all in one unit they are all trash and will give you the same issues you are having now. Get a separate modem and router.
I have this modem and it works very well on my 30/10 cable. http://www.amazon.com/Cisco-DPC3008-...n%3A6812730011
As far as routers go just look for something AC, unless you do a lot of file transfers over WIFI and can actually use the speed, the expensive ones are not worth it. There are a lot of good options right around the $100 range that you should look at.
Just some examples
http://www.amazon.com/TP-LINK-Archer...n%3A8514071011
http://www.amazon.com/TP-LINK-Archer...n%3A8514071011
http://www.amazon.com/Netgear-AC1600...n%3A8514071011
http://www.amazon.com/NETGEAR-Nighth...n%3A8514071011
BTW your link keeps getting taken over by Vaglink on my end so idk what you are actually looking at.