This is what I want:

P4 or AMD Athlon 2.4 GHz
512 MB DDR-RDRAM
Nvidia 128 MB Ti4200
Soundblaster Live 5.1
19" monitor .25 dpi
Windows XP Home
80 GB Harddrive
no modem card, already got one
regular keyboard, optical mouse
inexpensive speakers with subwoofer
no cd-rw, already got one
16X dvd-rom/48x cd-rom
no zip drive, already got one
no home installation

-I need a computer similar to this, that is reliable, and as inexpensive as possible like around $1000 or less.
Where can I get something like this? How, what are the advantages? etc
Thanks