My first response when thinking about the ultimate growth stock to buy with $1,000 right now was to go with a high-flying AI stock. But the more I deliberated, the less comfortable I was choosing one of those stocks.Don't get me wrong. I like (and own) several great AI stocks. However, I could easily name downsides to all of them. So which stock do I think is the ultimate pick to buy with $1,000 right now? After careful consideration, my answer is... Vertex Pharmaceuticals (VRTX 0.78%).Accentuating the posi ...