Use a VGA box.
It better happen so I can carry on with my life!Just a word of warning for those after a VGA box. Not all gamse support it, so you will need to check what games do.
http://www.shinforce.com/dreamcast/VGABoxCompatibility.htm

Been reading this thread and thinking about when I had a dreamcast a few years back... I never finished shenmue and never owned either sonic. I'm picking up a free SDTV tomorrow, so funk it, I'm go to start trawling eBay for an dreamcast, Shenmue and an RGB! I have Virtua Fighter 3D (well it looks like 3th but I'm guessing it is 3D), in my drawer, is it any good?

Been reading this thread and thinking about when I had a dreamcast a few years back... I never finished shenmue and never owned either sonic. I'm picking up a free SDTV tomorrow, so funk it, I'm go to start trawling eBay for an dreamcast, Shenmue and an RGB! I have Virtua Fighter 3D (well it looks like 3th but I'm guessing it is 3D), in my drawer, is it any good?