I have the MH1Cs, and if you tape the ports on them, and EQ down the bass, they sound pretty good. For the original $20 price I got them, they were well worth it, they're now well over $30, and I'd say that's a bit high. The biggest issue is the cable, I have no idea what animal that thing is designed to fit, but it's not human. It's also incredibly microphonic.
I would recommend the VSonics, even the GR02 Bass Edition, with a bit of EQing can sound great. I had the GR04 and loved it (make sure you get the flagship, not the classical, the flagship is being discontinued and as such is quite inexpensive: ~$50, and was once the second highest IEM in their lineup, the classical is lower end than the GR06). I really loved the GR04, but I really don't use IEMs often, so I've switched to the cheaper MH1C. My only complaint with any VSonic is the very tiniest bit of grain on the top end, it's really barely noticeable, and is better than most IEMs I've heard. The VC02 is getting great reviews. though I've never heard it.
By all accounts the Philips SHE 3580 is great, and can be had on Amazon for ~$8, if you aren't picky about color.