After scouring the Internet all morning I've come up short and haven't been able to pull the trigger on anything. To set the stage, I just bought the Massdrop Plus Universal IEMs, which are very sensitive with an impedance of 10 ohms. I have been driving them with a Fiio E17K on my desktop setup, which seems to be doing the trick with the exception of a tiny amount of background buzzing which is only really noticeable between songs. I'm decently happy with this setup, but I'm thinking of trying the iFi IEMatch to see if that makes the blacks completely black, but now I'm digressing. I'm looking for a DAC/amp to use with my phone, mostly on flights. I know I could use the E17K, but the form factor is just a bit too bulky for my liking for phone use. The Dragonfly Red caught my eye, but after doing more research I have come to conclude that there are much better, cheaper options with a similar form factor. At the moment, I think the Sabaj Da2 / SMSL IDEA are leading the pack and what I'm leaning towards... but then I found this on Amazon. I also found another one by Weiliang Audio in a similar form factor, the ES9023. Would any of these necessarily be bad options? Being that this will be used only with my Android phone, power draw is a concern. I don't need a ton of output power since my IEMs are very sensitive, but output impedance does matter and will need to be <=1 ohm. Are there any other better options for less than $150? Any help or suggestions are greatly appreciated!