Waste of time and money. All of the systems you listed look fine with composite, and you won't see a drastically amazing improvement.
You'll just see a dent in your wallet, and then the f*cker will break or need maintenance, and you won't be able to replace it with another 10$ TV from the thrift store.
Besides, PVMs are overrated pieces of shit. The forward thinking route would be to buy an upscaler from Micomsoft (XRGB3 or Framemeister), and use
1) Any new TV
2) *bonus!* any VGA monitor.
You know all those old CRT monitors that thriftstores have for like, nothing? You can jam upscalers into them. Boom. You get scanlines/etc.
They make cheap ass RGB cables for SFC. Cheap component for Wii. Famicom will look whatever-ok-sorta-whatever in composite, and PCE composite is pretty much the best composite that has ever existed.
but, you can RGB mod a PCE and shove it in there too.