hey Landdweller, i'd like to be helpful unlike some of the others here, so here is my best compilation of what i think is right for you:
Intel Pentium 4/ 3.4C GHz 800MHz FSB, 512K L2 Cache, Hyper Threading Technology $416
Thermaltake SilentTower 4 in 1 CPU Cooler for Intel P4 478 & Socket T, AMD K7 & K8, with Heatpipe Cooling, Model "CL-P0025" $49
ABIT "AI7" i865PE Chipset Motherboard for Intel Socket 478 CPU $108
OCZ Performance Series Dual Channel 184-Pin 2GB (1GBx2) DDR PC-3200 $540
SAPPHIRE ATI RADEON 9800 PRO Video Card, 128MB DDR, 256-bit, DVI/TV-Out, 8X AGP $207
M-AUDIO PCI Sound Card w/ Mic Preamps, S/PDIF and MIDI, Model "Delta 1010LT" $276
ANTEC Life Style Series Black Case with 380W Power Supply, Model "SONATA" $95
Logitech Z-5300 5.1 THX Certified Speaker System $139
Logitech Cordless MX Duo USB/ PS/2 104keys $75
NEC 8X Black DVD+RW/-RW Drive, Model ND-2500A $75
Black Mitsumi USB Digital Card Reader/Writers w/ Floppy Drive $35
DELL UltraSharp 2001FP 20.1-inch Flat Panel LCD Monitor with Height Adjustable Stand $850
Total: $2865 w/o tax or shipping (prices are from newegg.com)
i went for the p4 because its just more logical to take advantage of its hyperthreading for media work and i dont know why you would need a gaming cpu, such as the fx, for audio. the 3.4C is plenty fast. as for ram, i KNOW you will not even use up 2gb as of yet. when the time comes, just get another 2gb if you really need it. for video card, its powerful, but not the best. as for the sound card, its the highest quality one i can find and it also includes more features then any typical card. the speakers are 5.1 and are excellant, and the monitor is very hgih quality and large. in other words, i dont see how you could want a computer any stronger then this. and for the case, i chose the sonata because it is VERY quiet, which is what you'd need for all the audio work you claim to do. hopefully, this'll help you out. btw, for what you origionally asked for, you'd need about $5000 to get that.