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I must disagree with this for a few reasons...

1. AMD does not have any more tendency to run hot than Nvidia does.  AMD's 3000, 4000, and 5000, and 6000 series GPUs all ran cooler and were less power-hungry than Nvidia's flagship GPUs at the time (9000 series up until the 500 series); note that I'm excluding dual-GPU models for obvious reasons.

2. Temperature and heat output are not the same thing - more heat output can give higher temperatures, but higher temperature doesn't necessarily mean higher heat output.  This is important because the current Radeon 200 series has quite high transistor density, which gives higher temperatures but doesn't mean higher heat output - this is the same case with Ivy Bridge and Haswell CPUs.

3. The Radeon 200 series reference air cooler was crappy. Models with the stock cooler are still available, but you'd be an idiot to buy them since there's literally only 2 models of for example the 290 on Newegg compared to like 70 models with non-reference coolers, and those 2 reference models are not the cheapest models either.  Nevertheless, most reviews used the stock cooler since the non-reference models weren't available back in the day, so for most people the temperatures in said reviews aren't going to be accurate unless the review specifically uses a card with an after-market cooler.

4. Radeon GPUs have a user-selectable maximum temperature setting in the drivers that is set to 95c by default for whatever reason, and users that don't want it as hot merely have to turn the setting down.

5. It would be silly to buy any GPU right now - we know the 300 series is coming this quarter.  Even if you buy an Nvidia GPU, you would still be able to take advantage of the according price-drops.

DISCLAIMER: My current PC uses an Intel integrated GPU and my (currently unplugged) discrete GPU is an old-ish Geforce 8800GS.

Okaaaayyyy... may I ask how?

You could probably do it with Sandboxie, but just note you'd also have to run the media player in Sandboxie as well.

Considering the rest of his PC, it's very likely that the pricepoint of a 960 would be quite out of his league ($200 USD) - he could buy a whole processor, motherboard, and RAM for that price.

Honestly, GPU-wise I would look more towards HTPC-focused cards like the Radeon R7 240, but even then it's not that cheap. ($70 USD)

Besides, it wouldn't be the wisest to buy a new GPU now because AMD will be launching their 300 series this quarter (Q2).  Even if one doesn't buy a 300 series GPU, it should still mean price-drops on both older-gen AMD products and on competing Nvidia GPUs.

But by that logic it shouldn't be limited to specifically that but instead be user-customizable - in particular, some people hate high framerates and interpolation for movie content but are perfectly fine with it for video game footage and content.

Uhhh, SVP doesn't even work with native...

Also note, copyback has considerably better CPU utilization than it used to in the past in LAVfilters v0.64 and/or MPC-HC v1.7.8.

Lastly, you didn't say anything about your iGP.  Do you not have one?  I know that SVP in particular can be set to use your integrated GPU rather than your discrete GPU.

Then the obvious answer is to turn down your madVR settings.

Alternatively, assuming that you aren't using an LGA2011 or Nehalem-based CPU, you could try to set either SVP or madVR to use your iGPU (probably which ever uses the least amount of GPU utilization).

If you do the above, also try setting your LAVfilter decoder settings to DXVA2 copyback (assuming it isn't already set to that) which may help your GPU utilization a bit.

This would be awesome, but I can't think of any practical way that would make thing possible yet convenient to use without some sort of AI programming.

If your CPU has hyper-threading it's possible may in fact be hitting a CPU performance bottleneck - hyperthreading doubles the thread amount, so if your physical cores are maxed out but your virtual threads have no load, it would show as only 50% CPU utilization.

I made my own using said test image.

EDIT:

I find that I can navigate frame-by-frame in MPC-HC with SVP activated... (I realize that you're using PotPlayer instead).

Wait, SVP can't handle 4:4:4 chroma as the input?  I thought it was able to do so...

EDIT: Just tested it using this chroma test pattern and sure enough SVP cannot.  Huh, not sure why I thought otherwise...

Is it at least able to output at 4:4:4 chroma, like when downsizing a 1080p video to a 768p screen?

EDIT 2: It would seem that SVP does indeed process (or at least resize) and output at 4:4:4 chroma.