I've had an Evolution on my list for a long time. Would (er, will) be a nice addition for sure.My favorite tool is my evolution 15 inch cold cut saw. Perfect cuts in soft steel shapes with no sparks or heat. https://store.evolutionpowertools.com/products/evosaw380
Also love my chip pick up tool https://store.evolutionpowertools.com/products/mcc390
Hard to say what is favorite or most indispensable, but my belt grinder is way up the list.