Keep in mind when you go to buy needles that ballpoint needles come in sizes just like more traditional needles. 14 is pretty standard, but if you are sewing a delicate knit, you might need a 12 or even 10. (8 is the smallest size available. I've never had call to use one.)
What I used a ballpoint needle for most recently is hemming stretchy jeans. These require a ballpoint because of the way the denim is knit in order to make it stretch. But because it is still pretty heavy fabric, you need a thicker needer. I use 16 for lightweight jeans and 18 for heavier denim.