Which detector would be best for me.There doesn't seem to be much input regarding the 300. They both have similar freqs. Is the CZ 21 capable of greater detection depth? Does one ground balance better than the other? Occasionaly, I run into Black Sand on some Cape Cod beaches. Does one handle that better than the other? Do any BHID 300 users wish they had chosen something different? If so, why? I would prefer the Excal but they seem to be too fragile and not built to last.What a shame Whites,Garrett or Fisher can't develop a VLF water proof LED machine to go head to head with the Excal or CTX 3030 and keep the business here in the US instead of foreign markets