Hi there, I'm a photographer and planned on returning to a Mac after a few years of hiatus. I have been patiently waiting for the new Mac Mini for over a year and now, with the news of no more quad cores, I'm seriously considering a 27" iMac even though they're just out of my budget. I could get a 2012 MM but after installing an SSD on my PC, I won't go back to a spinner. I also just can't see spending over $1200 for a 2012 after getting one with enough RAM, SSD and keyboard and mouse when I can spend a few hundred more and get an i5 27". The problem is, I'm looking at the refurbished ones and haven't seen one with an SSD in my price range. My question is would booting from an SSD via USB3 or Thunderbolt give me close to the performance as installing one internally? If so, I may consider an iMac. Thanks in advance!