$2k? This'll be fun!
Asus K8V Deluxe K8T800 Motherboard - $150
AMD Athlon 64 3400+ $430
BFG NVIDIA GeForce FX 5950 Ultra - $372
Corsair XMS Extreme Memory Speed Series, ECC, 512 MB x 2 - $350
Enermax 470w PSU - $90
Turtle Beach Santa Cruz Sound Card - $59
Samsung Floppy Drive - $11
Lian-Li PC-78 Case - $90
Dell QuietKey - $7
Any Mouse You Want - $30
Nice Speakers - $200
That's what I'd get if I had $2k to spend on a new PC. That's using the parts you said you would as well. This setup is right at $1,800.
If you want less expensive options, just say so. There's plenty out there!
-Lasereth