The HDDs (the prices are the same):
SEAGATE HDD 2TB,SATA-3,64MBc,7200RPM,ST2000DM001 (12 months warranty )
SEAGATE HDD 2TB,SATA-3,64MBC,5900RPM,ST2000DL003 (24 months)
HDD WD 2TB SATA3 64MB - WD20EARX (36 months)
Would they be OK to use for boot drives? (I'm thinking of buying an SSD for that?)
Would go for th eWD... but it from theor "green" line - so is slow... RPM about 5400
For a boot drive - you want speed - so go SSD if you can ... or get at least a 7200 RPM HDD..
If you dont want to go SSD - I ould look seriously at spending a bit more and going for a WD black - which is the higher perfromance drive IIRC.