I have a Whites M6 with the Garrett Z link for wireless headphones, I am very happy with my current setup, and have found many coins, some rings, etc. I have been thinking of purchasing a Minelab 600 or 800, but am wondering before I spend the money for the 600 or 800 would I notice a very substantial difference with my current setup that would justify doing this? Most of my detecting is old home sites, Florida beaches, rural areas, etc.