I use Niagra spray starch and Mary Ellen's Best. I have not had any problems with the starch gumming up my needles. I always press my quilts really well before I quilt them. And I always wash my quilts before I use them and any starch gets washed out.
I was at Hancock Fabrics the other day and one of the ladies was telling us that the Lavender scent is a deterent to moths. Don't know if this is true, or just a way to sell more since they were promoting the Lavender Mary Ellens.