So my good old 500GB Momentus XT is at its limits. I never expected this day to come but it's finally completely full to the brim! It's not dead yet, so it's still usable, but the fact still stands that I need a new internal hard drive to accommodate my storage needs. Two common capacities exist above the 500GB mark: the 750GB drives and the 1TB drives. The 750GB comes in 7200RPM and in the Momentus XT 8GB SSD flavor, while the 1TB SSD comes in with 5400RPM with no SSD cache. I've been using the Momentus XT for 3 years but I really haven't seen its practical advantage (or at least haven't noticed it after growing used to it). So I'm debating whether to get the WD Scorpio Blue 1TB 5400RPM or the 750GB Momentus XT 2nd gen. I have managed Aperture libraries that I separate into many different libraries for archiving purposes on a stationary external at home and keep a main work library on my laptop. I've been trying my best to keep the growing number of photos under control but now it's just impossible! So the big dilemma is, which would be better for me, performance or storage?