new hd ideas

want to get a new hd to replace a small one i have , will put specs below and any recommendations would be appreciated
cpu - amd duron xp 1300
mobo - via vt8366 apollo kt266
system memory - 512 ddr sdram
video adapter - nvidia geforce2 mx 200 32mb
disk drive - quantum fireball cx13.5
disk drive - wdc wd400bb 00dka0
partitions
c; fat32
d; fat32
g: fat32
the one i want to replace is the quantum it is the g partition the wd40 is split between c & d any other ideas very welcome such as cpu , mobo or vid card