I don't have any experience to back it up, but I'd say go for the technologies you want to use: Good programmers can learn a new language pretty quickly, wherea

I don't have any experience to back it up, but I'd say go for the technologies you want to use: Good programmers can learn a new language pretty quickly, whereas knowing whatever is language du jour doesn't make you a good programmer. Hiring someone just because they know a framework doesn't really strike me as a sensible hiring strategy. There might not be as many Clojure programmers as Java Programmers, but there's probably a higher proportion of good programmers working in Clojure than Java. Hire whoever you can find who is technically able, passionate about tech and your idea, and I'd wager they will pick it up pretty damn quick.