Hi, I'm somewhat new to the "key-tuned djembe world" and I was considering buying either the Designer Series Key-Tuned or the Infinity Mondo Djembe. I've looked everywhere and I can't really find any distinctive differences other than the slightly higher price of the Mondo. I would also like a portable drum that I would be able to carry around town on my back so would you suggest the 12" or the 14" (I'm 6'1" with pretty big hands). I will mostly be using it for acoustic gigs/drum circles. Thank you in advance!