My experience with the Pioneer CH3 is good, too. The wire is pretty meh, but it has lasted quite well thus far (a few months of commute, until I subbed them because they don't isolate all that well).
I also have the HA-FXH30 and in comparison, the CH3 sounds more relaxed, but still reasonably detailed with a bit of extra bass.

This headphone deserves more attention, it is incredible for the price. Got mine a few months ago for 30$ CDN, IEMs never fit my ears however these are perfect I can put them in and forget I am wearing them. Even has a decent soundstage!

I really wanted to try a Final Audio IEM , what would you recommend? And is it worth it if I already have the CH3?

I've only heard the E2000 and if you already have the CH3 it's probably not worth picking that up. Maybe look into the E4000 or E5000.

Picked up the E3000 on sale !