Hi Russ,
I've used the in-ear monitors a couple of times- the Shure ones D Slam was reffering to. He's right in that you can feel isolated at times with them, and it could take some getting used to. The upside is that you don't have to absorb as many decibals in your ears cause you don't have to crank things up to hear.
Other factors that will play into the sound quality you get will be how your instruments are miked, and the type of sound board you use or pre- amps eq's etc.. (God forbid- a crappy soundman!)
When I used them the sound was boxy and not very flattering to my drums, or my inspiration cause it was so different than what I was used to with the floor wedges.
If I were to get some, I would want to have control over the eq-ing, and mix levels myself from behind the kit which I didn't have when i had my experience with them.
I know you said you didn't want to break the bank with them, but it is your ears your talking about. If I were to invest, i would go with these--
http://www.futuresonics.com/earmonitors/index.htmlBut I personally like a good floor wedge so i can feel the bottom end rumble and the movement of the air. Good luck with your search i wish i could be more informative, but that's all the experience I've had with this-
D.L.