Yeah Master System introduced console RGB to us on a wide scale. Nomad / CDX Neo Geo AES Jaguar Xbox and Xbox 360 should work but many of their games are arguably better with at least 480p.
Oh hey, that cable from post #18 is just what I'm looking for. Where can we get those? I've built myself something similar but unfortunately it came out looking a lot more "ghetto".
Looks to me like US and Japan versions of Sega Pico (as if there's much reason to use one) require a mod for RGB. Contrary to popular belief.
I came across someone who makes and sells them on another board just last night. You can find it right here.