box specs

Hello, All I have is cable and one TV - that's it - I do not own nor want a DVR - I would like to buy my own mini box but I am at a loss as to what parameters to look for - what type of box will work and what type of box will conflict with Cox.  

When I decided to buy my own Modem I found a good article in the support section that outlined exactly what I needed to look for and which ones were going to be outdated soon.  That was great and much appreciated.

I can't seem to find something along those same lines - a help article that would list "This is what you need and this is what you want to stay away from."  Does it exist?  If not it should - I grew very frustrated bouncing around between different posts Cox website, and the various "Learn about the active and inactive ports......"  ----- 

I do not own a counter TV - I have a very nice TV that I'm happy with.

Just tell me please what I need to buy - connecting the device is not a problem.

Thank you