Does anyone know a good capture card that can capture hdtv from a dishnetwork receiver's component or hdmi outputs? Also what kind of quality can it reproduce if there is such a card out there?

HDMI and component capture cards are very expensive (think in the $1000's) and they only do uncompressed video so your gonna need at least 1TB of HD space and a very fast CPU to get a decent amount of video captured before encoding/compression.

Only best bet is to get a STB that has a firewire port that can be used to compressed video or use a standard TV tuner card that has a QAM/ATSC tner(though both of these options won't allow you to record in HD, only SD)

Here's the cheapest HDMI capturd card I found

http://www.blackmagic-design.com/products/intensity/

The Blackmagic Itensity at $349 is alot cheaper than all the other HD input capture cards out there, but again, unless your runnning a dual RAID 500GB system with a firegl/quadro graphics card...

Remember,uncompressed hd from an hdmi port is about 123mbits/second. Its roughly 1 gig/byte a minute. around 58Gigs an hour

Anoter solution which is alot cheaper is to buy one of those PC's with Windows Visa Media Center that support CableCard TV tuners. I don't know if the satellite providers offer CableCards though