I am one to suggest maybe only building a stash of the colors and fabrics that you find you use or plan into quilts the most. Like the blenders and tone on tones. I like to have lots of batiks around and I pull at least two of the fabrics for every quilt from my small stash. we don't have the room either for a stash of really any size so I only buy for specific projects and fabrics that I absolutly love. I do have farbics that I have been given by family that I am trying to use or sell to buy fabric that I love better. so I would say just start building with only fabrics that you are planning on using. and plan three or four quilts out. You might find that you change the fabrics three or four different times. I am buying fabrics for my MIL's quilt and have changed the fabrics in and out 5 or 6 times. Good luck and post a pic of your stash as you grow it.