Nvidia's GPUs are still in high demand.Wall Street analysts often have one-year price targets available for the stocks they cover. While a single analyst may have a high or low target, taking the aggregate yields useful information.The average stock price target on Nvidia (NVDA -0.03%) stock is $153, with a high of$200 and a low of $90. Nvidia's stock currently sits at around$120, which indicates a roughly 30% upside. So, with that kind of upside potential in store for Nvidia, is it time to buy?Nvidia's G ...