Here's what I did.
I started with the JS Converta Caller. Then I added an MP 4 player, and then a Nady DK W1 wireless mic system. My total cost was 225. I added a memory card to the MP 3 player later.
I think I have a great sounding caller with a rechargeable battery that powers both the Caller and the Remote, digital sound, and it all fits in the case that came with the caller.