If you're just looking for cheap and effective with minimal cable mess, this should set you up right: http://www.amazon.com/Behringer-UCA2.../dp/B000KW2YEI ... it uses RCAs and has converters (up to 48kHz if you need) so it's probably plug and play. It will probably be better than whatever is onboard on your computer, and you don't have to worry about the stability of those miniplugs (I always wind up knocking them and then getting some fuzz or dropouts when I use them). There are even cheaper ones available that are just tiny plastic boxes with a USB cable and a miniplug input but they look even flimsier than the Behringer. And dealing with a miniplug adapter just complicates things.
If you're a stickler about sound quality go for something more expensive; you'll be paying for higher quality converters that will probably have a measurable (but not necessarily audible) impact on the quality of the conversion. I haven't ABX-tested digital/analog converters so I'm kind of talking out my ass here, but I'd be surprised if I would hear much difference between this unit and say a $200 soundcard. But if your budget is bigger (and/or you'd like to get into more serious digital recording and performance), look into sound cards from FocusRite or even RME. Native Instruments units like others suggest are also fine but if you're not planning to use Traktor I think there are better ones available at the price. But just for recording mixes you really don't need to spend that kind of money.
That Roland tri-capture looks like it will do what you want and then some; I haven't used it but I've had decent experiences with their (Edirol-branded) FA-101 sound card (I love it except for it requires firewire).
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