Anytime this question is asked, I say stock up on basics first. When you can get these on sale stock up. I usually buy bolts of Kona white and natural muslin at least 108" wide, I have found I always need white and beige in something and its also good for a backing also. If you find a fabric you can't live without, absolutely HAVE to have can vision in quilt and borders 3-4, if just in quilt 2 and if you find something that you like, don't have any idea what you're going to do with it 1-2 yrds.
I also love shopping the remanant bins! Great way to stock up on stash fabrics for scrappys.