Well, first of all those are 4200 rpm drives, I'm not sure what kind of performance you'll get out of them. Second, I think that most of the newer 7200 rpm HD's are quite quiet, and the 5400 rpm ones don't seem to make a sound. Personally, I think notebook drives are wasted in desktop machines.
The CPU HSF is the source of loud noise in most computers, that's where I think I'd look first to get a quieter solution.