I ran Coresounds for a couple of years, I found them to be decent budget mics, when the wiring was ok, but they were too poorly built to stand up.
What is it that you don't like about them? If they aren't getting you decent results, but are not giving you one channel drop outs (bad wiring), then there could be ways that we could reccomend to you to work them better.
Are these the standard CSB's with the battery box? If so, these are omni mics that need to have a decent signal. as they will pick up any surrounding noise/audience talk, etc. I used to "stack tape" in those situations, getting as close as I could to the stack of amplifiers, which would cut way down on the audience noise. They are not good mics for being in a big auditorium.
If you are getting distortion in your recordings, it could be that the mic set needs a new battery. or that you have your deck set wrong. I ran "line in" to my DAT with the cs mics, and changed the battery every 6 months and eliminated that issue. You also need to unplug the mics from the battery box when not in use, as it will otherwise drain the battery even when not recording.
I'd try a number of settings on the deck and mics, record some friends bands, or just go to some shows you don't care about whether the recording sounds good or not (country, hip hop or bluegrass would be my suggestions here
) and try to see if you can get this to work for you before buying more gear.
Let us know what your dislikes are and maybe put up an mp3 sample of what you don't like, and some folks here will be glad to help.
and, welcome to the board and to the taping community.