Matt has a couple of good points, so let me clarify. The Dell ST series (I have an ST2310L) are nice flat screens that will sync to 15khz once you get the correct signals into them. The Indivision ECS is a $100 scan doubler/flicker fixer that puts out a 31khz screen with a few changeable options. The cheap GBS-8220 stuff on eBay will give a crappy 31khz screen, but using a SCART cable to a SCART-to-HDMI (you would need an HDMI to DVI adapter) will give a quite nice large screen output for about $75. The Microway FlickerFixer and the A2320 card fit the A2000's video slot and will also give a standard VGA output. Don't buy the eBay "15khz to RGB YUV video" piece of junk. It will give you a composite quality picture.
The AmigaKit 23-pin Amiga to 15-pin VGA only works for AGA Amigas, so don't be tempted.