Well, in order to use all of the items you listed, you'll need to buy a new motherboard and most likely a new power supply.. If your computer currently runs Windows 98, I seriously doubt it will handle an AM2 CPU, nor will it handle DDR2 memory, PCI-Express, etc..
Computer components need to be "matched".. Since you seem to be taking the AMD route with the CPU (Good on ya, mate!), I'll try to explain..
Socket A CPU (XP series)
DDR (DDR1) RAM (PC3200 DDR400 Maximum Stock Speed)
AGP8x or PCI Graphics
Socket 939 CPU (Athlon 64, Athlon FX series)
DDR (DDR1) RAM (PC3200 DDR400 Maximum Stock Speed)
AGP8x, PCI, PCI-Express x16 Graphics
Socket AM2 CPU (Athlon 64, Athlon 64 X2)
DDR2 (DDR2) RAM (PC6400 DDR2-800 Maximum Stock Speed)
AGP8x, PCI, PCI-Express x16, PCI-Express x16 v2.0 Graphics
Socket AM2+ CPU (Athlon 64, Athlon 64 X2, Phenom X3 and X4, etc)
DDR2 (DDR2) RAM (PC6400 DDR2-800 Maximum Stock Speed)*
PCI, PCI-Express x16, PCI-Express x16 v2.0 Graphics
* - DDR2-1066 is the speed used by the Phenom CPUs, but typically must be manually set in the BIOS.. Most motherboards will by default put the memory in DDR2-800 mode..
If you're looking for a "Best Band For The Buck" build on the AM2 platform, you can't go wrong with the ASUS M2N-E Motherboard.. It's one of the better non-SLI boards available with the nVidia 570 Ultra chipset.. If you prefer an AMD chipset, NewEgg has plenty of those available as well..
Also note that almost all AM2+ motherboards will support AM2 processors, too..