Such great suggestions...I would add...think about the type of quilts you like and what you like to sew...Are you a scrap saver? Then by all means makes space for them...do you make your own precuts? Make space for sized bins. Many have benefited from Bonnie Hunter's system...
http://quiltville.blogspot.com/2005/...rs-system.html
Best of luck on this new space...you will love it...