You will probably get as many answers to this question as there are members. However, one that you rarely see mentioned on this forum, but I have found to have excellent sound quality, the complements of my instructor (who uses DCs and complains of poor sound quality on many of the other cheap models), together with many features found on the more expensive ones is the Flightcom 4dlx.
I have not experienced any compatibility problems. However, I was nervous about this before buying mine. Check with the supplier that they will be happy to take them back/switch to another make if you experience this.
At just over £100 from pilot warehouse (not sure what other suppliers charge) I recon they're pretty good value and more than adequate while you're training.
HH