I'll elaborate more on the 'proper' use of an SSD, or at least, how I use my SSDs.
I have a 120GB SSD in my MacPro that I install all my programs onto, Ableton Live, etc.. I installed all the programs onto the SSD so they run optimally and faster. I then have a 1TB hard drive built into the MacPro and then a few external HDDs that I store all my stuff on. You can buy SSDs in MacBook Pro's as well now.
By the sounds of things, all you want is a HDD, a few TB (so maybe just 2-3 Portable ones...the LaCie Mini you linked will get the job done, and could probably be found cheaper/second hand).
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