Dude. The wireless in ear monitor is the way to go. I use the Shure PSM600 setup with E5 ear monitors. It's not cheap. But it's really made a difference in my hearing and my playing.
Besides getting the setup, you should also see an Ear Doctor or find out if you have a Musicians Hearing Services or something like it in your area. You wann get custom ear molds for whatever in ear monitor you want to get. These will insure the best fit, you can wear them for hours on end, and you get better bass response.
Now here is another part of the deal. If you go cheap on this, you will most likely be very dissapointed. I do not recommend that you use anything less than the Shure PSM600 system with either Westone UM2 (which I'm about to switch to) or the Shure E5.
Now, I do not have an amplifier at all. I run my Series II directly into the console and rely strictly on the IEM for monitoring the band. At my Church, the subwoofers are under the stage and I play barefooted. So I feel everything too. It's really awesome. If you don't have the luxary of subs like I do,l then I would recommend a Buttkicker Platform
http://www.thebuttkicker.com/images/Bass%20Station%20Platform.jpg I played a gig with only one of these. No Amp, No Monitors, No IEM. I just stood on the platform.
OK I could go on about this for days, because I use it a s a bass player, a professional sound engineer, and I sell the stuff.
I don't normally like to hawk my wears here, but if you're interested, shoot me an email and I'll give you some pricing. (special Alembic Club Pricing)
www.zamarmedia.com