Well, I guess I got my wish. Here is a copy of my post from October 17, 2012 at http://www.findmall.com/read.php?27,1795744
"I have a Minelab GPX 5000 and a Minelab CTX 3030. I am a firm believer at this point that the GPX 5000 has taken PI nugget detecting technology about as far as it can go, with only better ferrous discrimination the only thing to offer me. And I am not holding my breath for that. So where to go from here?
Pretty obvious I would say. Cram the GPX 5000 into the CTX 3030 package. I see no reason why it can't be done. The only limitation would likely be battery time per charge but if a CTX style battery could get me just a half day operation I am fine with changing batteries at lunch. A GPX 5000 is a single package with built-in speaker and GPS and waterproof to 10 feet would be killer. A new coil set mimicing the CTX set would be great as new waterproof coils would be a must. 8" mono, 11" (or 12") mono and 11" (or 12") DD and 18" mono would be all I would ever need. People are already using the GPX for beach and relic hunting and this would put it over the top. I would be using it for almost any detecting at all except where discrimination is a must, like turf hunting in a park."