Hello,
For the extra money, I'd also suggest the 7s over the 5s and still very light. If the 1500 is like the 3000, then I'd suggest the Yammy for live play, for the 7s has a bit more menus for "on the fly" performance. If you can afford the 3000, then go there. I loved a lot about my 7s though, it is a great sounding board. Only you can decide and good luck. My opinion only.
zuki