Well thanks guys, I also did some research myself, and I'll update you in my choices soon.
I hope I can burn around $1500 which means a lot since I already have:
Printer
USB scaner
Creative Audigy Platinum PCI sound card
Inspire 5.1 speakers
GeForce2 Mx/Mx 400 64 MB AGP
AOC Spectrum 7Vir
My dad uses a Pentium 200 right now from which I will take the flopy, CD and HD and stick them in this one, and get the components of this one:
Toshiba DVD-ROM SD-R1002 which is also a CD-RW
Flopy drive
20 Gig Quantum Fireball Ict 15 HD
This way I can spend a lot on the mobo, processor, cooling, power supply and case and get the upgrades of the rest in the future (I already have top of the line sound

)
Anyways once I reduce the list of the mobo, cases and power supllies I'll give an update.
I will get Athlons between 1600+ and upwords (but I'll keep in mind the dual processor posibility)
Have you guys heard of the new dual on board BIOS memory on the new Gigabyte mobo's?