Viewsonic makes one, a bit pricey (around US $180) but it looks da shizznit. With one of those 23-15 pin adaptors, you could plug your amiga right through it to your LCD...no crappy composite video...and then use the remote to adjust to your LCD's "native" resolution, and the viewsonic will scale/fit the picture as required. Picture quality is supposed to be great.
The cool thing about using this with an LCD, is that you'd get a nicely scaled, hi-res picture with NO 60Hz eyestrain like with a scandoubler/crt.
Here you can see pics of the ports and cables it's sold with (link to newegg.com).--edit--duh, looks like the RGB ports are for passthrough...so you'd have to make an RGB-SVIDEO adapter.
