It's always good to have two little drives though, incase one breaks down, and you could use the extra drive for back-ups. However, with the small size of those raptors, you might want some more space. Opt for a 120 or 160gb hd. With prices these days you could get a 300gb under $200 if you knew where to look.
Rig -- Emachines T5026, 3.06ghz P4, 300W Bestec PSU, 160 sata hd, 512mb dual channel 3200 ram @ 3-3-5-8, ATI Radeon 9250 pci, dual layer 16x dvd+/-rw.