Hello They do make some that are, Just to get an idea go to Ebay and do a search for what you are looking for. They have all kinds of cards that will fit your needs. Then when you find one that fits your needs buy it, or go and buy a new one.
Only consumer cards that have component in only accept a 480i signal. Even then I'm not sure they let you record from it, their primary use is for scaling. Here's two popular ones:
Yep, don't think there is any component input HD cards, just ATSC tuners. I think the bandwidth would be really high for trying to capture analog HD (the reason ATSC or Firewire/SDI cards work is because they are taking in an already digitized MPG stream).
To be honest the analog HD capture hardware for professionals is still even ungodly expensive.