Since it seems like you're on a budget, I think you should go for the Philips PSC805 Aurilium. It's built like a rock, looks great and will give you excellent sound quality from its lineout. It should easily outclass the onboard sound out of your lapton. I had a Soundblaster Live 24-bit which is supposed to be about the same sound quality wise as the Audigy2 ZS when used for music. I think the Aurilium easily destroys it in sound quality. I think the Aurilium is discontinued, but you can find them fairly cheap at 20-30 bucks on ebay.
I want a unit that has RCA output jacks. Thanks for input.
You can always buy a cheap cable adapter for that.