I second the iScan. I use it for my non-progressive sources (second DVD player, VCR, and formerly, my laserdisc player): excellent line doubler. So good, in fact, that when I upgraded to a progressive scan DVD player, the improvement was only a mild one.

You can get them for a song on eBay, and as far as I know, the only major differences between versions are the input types available.

Jeff