Online loan marketplace LendingTree (NASDAQ: TREE) is what investors' dreams are made of. Though it's in a highly competitive industry, the company has found a niche as a middleman that funnels consumers to lenders. The result? Shares have rocketed by 1,740% since it went public in 2008.While it's tough to find the next LendingTree with 1,700%+ return potential in less than a decade, we asked three of our Foolish contributors to give it a try.