This may sound obvious but the biggest boost to old console pictures won't be seen without a good CRT. I have most of my consoles running on RGB and the difference isn't that great on a cheap Mitsubishi TV I have in the bedroom and the picture looks terrible on my LCD telly.

On the other hand, when I run any of my consoles in RGB on my Panasonic CRT the improvement is astounding. Sharp, crisp and vibrant, all my consoles look much, much nicer.

I can't stress enough the importance of CRT for old consoles. Afterall, they were designed around this technology and some systems/games even rely on things like raster scanning etc for smoothing, extra colours and special effects.

In short, buy a good quality RGB telly or monitor (I recommend Panasonic or Sony) and decent RGB cables.