I have that Creative Sound Blaster in my computer and it works wonders. Download the audio control panel from Creative and set up to the highest sound quality settings. There's also a option that makes normal music a LOT less flat sounding and it also has a reverb option. Great Sound card, I have to say it IS needed if you love music and sound quality.
And Guy's! Your Holding Back. He has a $1700-$2000 Budget! Give him what he wants and throw in a 4870 X2:
That video card smashes a 280GTX to pieces!
Add $130 to that $1065.95 and you get $1195.95. That leaves you with about $400-$700 for a monitor, keyboard, Mouse, Operating System, HDD's, PSU, and Water Cooling kit. If you could find a 4870 X2 Water block or two water blocks for the two GPU's that would be great!