The hottest and best product to sell will depend greatly on the market you will be selling at. Other factors you might want to check or may affect how well your products will sell are market competition, target population and location, demand, current prices and reliable supplier leads.
Personally without due diligence it would be hard to say that this 'IS' the hottest product to sell! Since what may sell well for me may not necessarily sell well for you (and others) :)
Learn more about your target market first, and don't under estimate the power of research! Then for sure you'll discover a highly profitable niche!
Good luck :)