The DX2 is double the price of the other one. My computer speakers aren't very good at the moment (unless I get new ones for Christmas) so I'm inclined to not do a sound card at all and use the onboard. I was trying to keep the price around 1000, without monitor (just ordered the Dell 2409w btw). If the sound is bad, I could always put on in later.

Just didn't know how much worse the onboard would be vs. buying a card.

Haven't looked into digital connections from the case, so don't know what's involved there.

There won't be a receiver involved.