RGB to component is easy & relatively cheap. I've been using
this for several years & can't fault it.
RGB to HDMI is more expensive. You're really looking at scalers at that stage. There are some cheaper options available but I have no personal experience with these & I'm not sure if they'll do direct RGB conversion:
http://www.tmfsolutions.co.uk/Gefen_HTScaler.htm
Many newer receivers do format conversion too but usually from composite/s-video to component/HDMI etc.
I'd say the
JS-Tech scart>yuv would be the best option.

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