Hi,
I can't tell you what you should by because there are just way too many nice detecting units out there. But what I can tell you is I love my CZ 5. It works great in trashy area, but is a detector you have to learn the tone responses to work well such places. I had problem in the beginning understanding some of these responses in trashy areas, but after many digs and persistence understood them. I used the standard coil to learn this. A smaller coil may make it easier for one to learn to work trashy areas. I am happy though using the standard one, at fairgrounds and parks.
Jim