So im pretty sure my 2nd HDD is failing, started making sort of clicking noises and get a slight grinding as it spins down. Allready got my data backed up, just what to replace it with? Taken a look around and narrowed it down to two options: 1. Western Digital 500gb (whats the difference between black, blue and green? all seem to be within £5 of eachother) 2. Intel x25-m 80gb ssd Is the SSD worth the extra £100? (will also have to wait around a month longer to afford it) or go for one of the WD drives and SSD some time in the future?