I use the fabulous Troy ShadowX5, it is light, very powerful and very sensitive to the smallest and thinnest hammered coins. I use the 7 inch open centre /polo coil as opposed to the spider coil, it really does produce the goods. I know it is an old cliche but it really is finding stuff that my other detectors have not been able to find on fields that I have detected on for years. Yes you might say that with each new plough finds come to the surface and I agree but some of the fields have been untouched for years and I have been over and over them more often than not with a? new detector that claims to ferret out new finds from deeper. If I could pick a fault with it, there are too many buttons that whilst they look good don't actually seem to do what they say in the field.
I think the Silver Sabre had the right idea, Knock out most iron at between 0-2 (except large pieces) and then find treasure >>> simple! It was and still is an excellent machine but unfortunately lacking in depth.
I also have a Cortes a Powermax II a Spectrum and a Newforce 1