What Capture Card Should I Get And Where?

I don't know anything about capture cards or PVRs or whatever but I want to start recording some of my minecraft, EZ Muze, Call of Duty, and other stuff from my xbox. I'm not looking to become a big youtube gamer or anything, it's mostly just for the sake of saving memorable stuff for myself but I still want it to be pretty decent quality. I don't want the video to be blurry or fuzzy and clear audio would be nice. The only capture card I could find in stores was something for $180 which I'm sure is great but I wasn't really wanting to spend the money for a high end one. I heard they can be anywhere between $10 and $200 and I think $40-$80 would be ideal. I mainly just want something that's easy to set up and use. I don't even know anything about like do you need software to get the video from card to your pc or is it like an external harddrive type of thing? Then I hear you have to press record but I imagine there's only so much memory so how do you know when it's full and not recording anymore and how annoying would it be to have to sort through all the video you don't want? Any answers would be great. I'd prefer to buy one in a store but everyone seems to say I'm gonna have to go online and they all suggest I spend like $200 for a Hauppauge.