Considering the specs you've provided—a healthy 700GB of remaining SSD space—your system should handle most VSTs without issue. VSL is incredibly meticulous/precise, like it's got this knack for hitting just the right notes w/ surgical accuracy, and that's helpful when nailing the dynamics in bigger arrangements. Then there's EWQL is best for a blockbuster movie soundtrack type of mega-arrangement. For something different, check out 8Dio's offerings. They have some really sick stuff like their "Adagio" strings, which are all about expressive legato, and they often incorporate unconventional playing techniques for that extra flavor.