Hi, I'm torn between buying the deal of the newest mbp 2.3 ghz, 16 ram, 512 hdd for $2350 vs a used one locally 2.7ghz, 16 ram, 512 ssd for $1850. Did anyone made this switch or compared both in real life? Most of the use will be in lightroom, some photoshop, parallels. Do you notice the faster hdd? Does the thunderbolt 2.o brings you any advantage if you edit directly from an external hdd? Thank you all who would chime in.