CRT monitors are actually great for console use. If you have a Wii, get one of these bad boys to connect it to your console without any conversion/lag (assuming the CRT monitor has a VGA port). Nothing looks better than progressive scan Melee on a CRT monitor. It's buttery smooth.

Note: for audio you will need to plug those white/red coax cables into a portable speaker of some kind, since CRT monitors generally don't have speakers. For a 1/8" jack, you could use this.