I had the Go and Go Baby and switched to the Studio. I use the adapters and kept a lot of my dies. I also have some Sizzix dies and the adapter for them. Even though the Studio is "stationary," I find it more versatile for my use. I also use Ebony Love's book, "The Big Little Book of Fabric Die Cutting Tips," for reference. She also talks about using the different dies on different machines and has a website.
Watch for sales and compare prices. I bought my Studio when Accuquilt had a great sale. However, Accucut (a sister company) sells the Studio under the name of the GrandeMark. They don't have sales at the same time. I know other sites like JoAnns, Michaels (?), and Amazon may also sell the Sizzix machines.
Buy what will work for you.