Difficult choice.
MC does a pretty good job at TV these days. Not perfect yet, but a TV Champion (Glynor) was recently appointed to push it to the next level, and Yaobing is doing a great job in fixing certain issues and adding functionality. The Time Shifting is brilliant, and the recording features good. But recording features all depend on the quality of the EPG you can get into MC, and that depends on where you are located to a great extent, and whether EPG data is available free for your location. I suspect you are in North America though, and so the built in EPG capability should work for you.
That said, if you aren't very technically savvy and you want a simple solution, AND the EPG that comes with the Channelmaster DVR+ is reliable, accurate, provides all the data you need, and will exist in the future, AND the recording rules for series etc. work well, then the Channelmaster DVR+ may be the best solution.
You really need to check out those capabilities of the Channelmaster DVR+ though, and makes sure they are real and work as advertised, in your area. See
http://www.cnet.com/products/channel-master-dvr-plus/BTW, that $249 price does not include a hard drive, and only has 16GB memory required to Time Shift, pause, rewind, and record TV. It costs $399 with an internal 1TB hard drive, or buy your external own. If you need wireless network, although it sounds like you don't, that will be extra. In fact that CNET review mentions a lot of extras. If the cost gets close to a new PC, MC offers a lot more functionality.
Also, lots of TVs provide basic Time Shift, pause, rewind, and record TV functionality, along with a built in EPG. All you need to do is add a hard drive, which you have to do anyway.