I'm also considering the Astrotec Am-90s. They are $40 on amazon, and they do have a 10/10 value on here... They have a 3.5 isolation rating, which should, under normal conditions, give me the isolation I need. Plus, it has a 4.5/5 rating on comfort. It seems to come with a ton of tips, so that's also nice.
I have the Astrotecs. They're very smooth and with a Fiio E17 gain some extension (over being driven purely out of a clip). The cable is among the best universal cables I've seen. For the money I think it's damn good sound. Isolation is middling and the foam tips they supplied will not stay on even with the (also supplied) little rubber sleeves. The silicone tips are average.