I use the Thomann PVC cases, they are light weighted, but protects the instrument perfectly, much better, than a soft case could do. Possibly they are a little heavier, but everytime I received the case, I thought "Did they do wrong? Did they send me a keyboard bag instead?", because the box wasn't heavy.
You can save money and buy the cases, that they made for Genos or spend a little more money and decide, that it may have another color (that's helpful, when you use a twin set and so you are not confused).