I just realized there is a HA-FX3X and the FX1X. Which should I get? Should I send mine back?

Just ordered a pair of the JVCs to see how they do. Perhaps they will surprise me (I hope). I have a very difficult time narrowing down what to put on my iPhone currently for music in the gym and to listen to daily since I am listening to music for roughly 6-9 hours a day. I also get bored but...

If you went cheap, do you think it would be worthwhile to pickup a FiiO e5/6 or e11?

I may also end up going over ear and possibly picking up the XB500s. I am just not sure how well they would stay on during a workout. I have also looked at picking up several other in-ear but not sure which ones really provide good strong bass.

Ok thank you. I was looking at the e11 but didn't wanna waste the money.

I am sure there are other threads like this, but I have searched a bit and couldn't find exactly what I was looking for. Basically, I have an iPhone with with several different in-ear sets. I hit the gym every morning and listen to metal and harder music ro dubstep which incorporates a lot of...