When you think about your completed quilts, does it seem that you are drawn to quilts with a specific patch shape? Lots of HSTs or Flying geese, maybe strips? I would get those dies first. When you first get your cutter, the impulse is to also get lots of dies for future quilts of unknown patterns, but it's better to start with a base of the shapes you use often or you have a specific quilt planned and can use those shapes.
I personally think it's better to pay full price for a die I need for my next project than get a couple on sale that I think I'm going to use 'someday' only to never use them. I also think I should follow my own advice more!