rusty, the DeLeon is a great machine for coin and relics but don't expect as much for it's ability to find nuggets unless they are large ones IMO. The freq of 10 kHz is a mid range which will probably serve your needs 90% of the time but for nugget hunting, you'd want something that has a manual ground balance as the soil and conditions where nuggets tend to be is usually more mineralized.
You might also look at the Vaquero as a more rounded detector and is just a bit less in price. One person here that you might ask is JOE(USA). He not only knows his stuff but is also a dealer.