Not very relevant, maybe, but I can remember when 80Mb was heavy, and when I got myself a 400Mb HDD, I was thrilled and thought, nothing can get better...
Now I have two 120Gb SSDs, and a 1Tb HDD, and another 1Tb in reserve, and I also have a friend who lost 4Tb in a crash - a modder. The "increase in data" is incredible.
Going to mechanics, I can remember one of the classic cars, Ford Anglia. All you needed was a screw driver and a wrench, and you could fix everything. And it's only some decades ago.
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I'm not sure a SSD of 120Gb would be the right solution. You seem to have an issue with capacity. That would more easily be solved with HDDs - you can get a 1Tb HDD at the same price as a 120Gb SSD, or even lower price, and present HDDs can perform anything you need - SSDs aren't that supreme, in daily life.