My first Computer that I built

I have just completed my first computer that I have been building for the past 6-8 months now. here isa list of what I have in it right now.

a NEC Fe700+BK (moniter).
a geforce fx 5200 128 mb.
a 1800+ AMD CPU.
a matasonic motherboard.
512 DDR400.
a 52X cd-rom drive.
a 52X24X52 CD-RW drive.
a floppy drive.
400 watt power supply.
a ATX black case with window.
a modem.

I am planning to change all of the guts of my computer sometime this summer. A list of what i plan on getting.

a Gigabyte 7VAX motherboard.
a 2600+ to a 2800+ AMD Barton core CPU.
more memory so i have about 1536mb ram to 2048 mb ram.
I think that is going to be all that I am going to add this summer.