UM Pro 30 (1st Generation)

Shure 215 are the best value on a budget. You can get a pretty decent mix if you know what you’re doing, but the bass is a little low. I’d recommend going a step up and looking for a two-driver or three-driver model. I think the 315 has two drivers, and heard good things. Personally I rock Westone UM30 which sounds amazing. Wouldn’t go beyond that.

Shure 215 is the best value option. It's generally good enough for singers and instrumentalists, and can be made to work with bass if you mix it right. Shure 315 adds another driver, but also adds a bit of cost. If you want a little more ooomph on the low end, I roll with Westone UM30 -- but any two or three driver IEM will have much better and clearer bass response than a single driver.

I have a Behringer P2 wired pack and Westone UM30 for ears. UM30 monitors are a \_huge boost\_ over basic Shure 215. My P2 works quite well, considering how hilariously bent out of shape the metal is. P2 should run $40 or so. I think I bought my UM30 on sale for somewhere between $200-$300. Very rarely do I play a stage where I would greatly benefit from a full wireless rig, but I've often thought about upgrading.

Westones. They have a selection of responses to suit your needs. I have the 3 driver ones for extended bass, I'm a bass player and bg vox. Good isolation, good clear reproduction. Comfortable to wear for extended periods.