It depends on your budget, how much room you have, and what you are going to use it for. If you can make the investment, I would go for the Accuquilt Studio2 (the sale price is great). I have a Studio and you can use almost every die on the market. Also, the Studio2 has an advantage over the Studio in the fact that you can now fold it up for easier storage.
Go to Ebony Love's website. She has a comparison chart that might help you choose (
http://www.lovebugstudios.com/cut/machine-comparison/). I believe Ebony has most of the machines. Hope this helps.