cappuchino
Previously known as sub30
Summer should arrive within 8 days.Then the cable might be good as well. At the very least, I recommend waiting for the Summer to arrive before you decide to spend more.
Going balanced is almost always better when it comes to amps with both SE and balanced (since they will put more effort into the balanced port). Not sure what source you are using but upgrading it could be your next step.
I'm using an iPhone 5s which I think is "decent" as a DAP from the measurements available online. Not yet sure if I wanna invest in something "expensive" as I have a habit of getting into hobbies then leaving after a few months