OK, it's time, once again, to set that New Year's Resolution. Which one of the products should I buy, use furiously for about six weeks, then let collect dust in the garage or basement, and eventually put on eBay or craigslist in April or May for a fraction of what I paid? (or alternatively, use to transform myself into the Incredible Hulk

).
Any input, serious based on experience, or otherwise, is appreciated.