Never buy the #1. (although I have made money doing just that).
Buy your stock using IBD as a starter list and then do some homework on the company. Try to buy a stock that has (what you believe to be) upcoming potential with increasing earnings and or new product. VDSI has been on and off the 100 list since January (Well, that is, that's when I first noticed it. it may have been on there earlier.)
I've made lots of $$ since subscribing to IBD. I've also taken their seminars too. and read their books.