In that case, you should keep the S9 and I do have a Cowon Z2. The sound right now is fantastic and though I have experimented with the EQ on it, I have decided in not using any EQ and playing it with a Neutron Player. The reason I bought mine was because I lost my Ipod Touch
The sound is fantastic and I'm flabbergasted that people said they are not getting enough bass response. When I was EQing it hard, I was really getting "fun" music at the expense of some headaches, which I don't entirely mind, because the bass is extremely strong and I'm using a dual armature IEM.
As much as I like bass, I find that I'm not really getting goosebumps if it's too bassy. I want things to be in somewhat moderation. But everyone's tastes are different.
Installing Apps on it isn't a problem anymore. Google Play DOES work but you'll need to put into your hard drive, in the root directory of the device. Once you have it, you WILL be able to get apps like normal.