I've tried using the standard Amiga output to VGA, then a cable to three component RCAs. Most LCDs automatically deinterlace and can accept signals without modification including 480i (15 kHz), 480p, all common VGA resolutions, et cetera.
With a cheap 42" LCD I was able to use Productivity, NTSC interlaced (which was rock solid except for the slight edge blur on moving things) and high resolution NTSC interlaced (which looked pretty decent on the widescreen).
I'd say get a TV first and then see whether you need a deinterlacer.