to be honest man i'd go for a larger capacity 5400rpm drive for less money. you won't really see that big of a difference between a 54 and a 72 on that machine.

two i found with a real quick newegg.com search:

120GB 5400RPM 8MB Cache

80GB 5400RPM 8MB Cache

i have almost the exact same 120GB drive in my 1GHz TiBook (its a samsung spinpoint M, but i bought it over a year and a half ago so its probably an older model), and it has been excellent. very quiet, good performance, etc.