Hi!
The DVDO iScan Ultra is one of the best doublers out there that doesn't cost a fortune. I've pasted in a link to a recent review of their latest component. There are also links in the review to take you to the manufacturer's website, manual, etc.
The Ultra doesn't have a component (RCA -type) output, and uses a DB15 connector, but you can buy break-out cables that will convert from DB15 to RCA type for you. iScan or a retailer can probably recommend one for you.
Good luck.
http://www.laaudiofile.com/iscanultra.html