yep - just look for an IDE drive preferably larger than 10 GB
i can fully recommend the drive i have built into my box (check my sig) - it's a 5400 r/min, but it's really fast - never had the impression i had to wait for something to really load long and i also can't imagine a 7200 r/m drive to be significantly faster.
the good thing about this drive is that it's very silent - it's actually less noisy than the one that came with my box and it's cheap (i paid $ 135). another thing is the heat problem which might be bigger with faster spinning drives - but i can't say anything about it except that i read many posts in various forums that nobody really ever had a overheating problem with 7200s