I would not recommend one to a newbie. There are some that work well, but software can have a very steep learning curve. You will end up with a lot of frustration, especially since you don't know how things are supposed to act. Also good to have a basic receiver to throw in line to make sure your dish and such is set correctly. That way you know it is a matter of get the card drivers working and software working.
I also don't recommend a USB tuner. I would build a small HTPC(Home Theater Personal Computer) and get a tuner that is PCI-e card.