Hi, I'm in need of a couple of external HDDs for secondary backup at work and they need to be pretty quiet since they'll be connected most of the time. Only thing is I'm on a pretty limited budget of £65 per-drive with a minimum of 500GB which limits my options a bit, Any ideas which would be better/quieter/more reliable? 
Western Digital My Book Essential 500GB External
vs
Samsung HD501LJ 500GB SATA 16MB 7200RPM HDD + Icy Box 390 Caddy
Or any other options that will come in under/very slightly over my budget? Thanks in advance.

Western Digital My Book Essential 500GB External
vs
Samsung HD501LJ 500GB SATA 16MB 7200RPM HDD + Icy Box 390 Caddy
Or any other options that will come in under/very slightly over my budget? Thanks in advance.
, and for £20 it's a steal