The RGB breakout won't work without substantial software hackery that I don't think works on Windows (at least not with nvidia cards). You have to configure the RGB output for standard res, sync on green, and you have to get it into the YPbPr color space for it to work with a standard television component input. The former is doable (there are several options), the middle works on many cards with the nvidia driver tools, but the latter I'm not aware of any way to do on Windows (there's a hack to do it on Linux, though).
The "s-video" breakout is for cards with "HDTV" output. The connector is more than just s-video, it's actually a YPbPr output from the TV out scaler. This would be the best and easiest option if your card supports it, but check that it does as many (most?) do not. If you do not have this connection on your video card, just use S-Video. At 480 lines, it looks just about identical to YPbPr in all but some pathological cases.