I love my Go Baby! I got the smallest one because it was on sale for around $79. It stays out all the time and I use it for almost everything. Do I wish I had gotten the larger one? Not really--for the money the Baby does everything I need & want.
I try to cut thrift store finds into usable pieces right away so they're always ready to be sewn (a sort-of scrap system that makes it easy to use them). I use my 5" square, 2.5" strip and 3.5"x6.5" brick dies the most. I just ordered the small tumbler and I think I'll use that a lot too. I have purchased all of my dies at Nancy's Notions because they are (almost always) at least 30% off retail even when they are not "on sale."