That's a difficult question. It seems that the $100 will disappear if you don't use it all at once within the period, so please use it that way. The comps marked 'realtime' and simple effects can be integrated as standalone into the Antelope Zen Quadro audio interface, so you can use that as a reference, or you might consider buying the missing elements for your own setup. Also, during sales they can be 90% off, so targeting those items gives a stronger sense of value. Personally, I recommend things like DXDesser, which you can keep running continuously.