IMO - I'd hang on the Silver then would add another machine myself. I did some gold detecting, more like a few times a year for a few years. I didn't know if I was going to get into it more, or less. I started out the the GoldMaster-2, then added the GoldMaster-3 and then the GoldMaster-4B. Out of those, I liked the GM-3 the best. Looking around and and not in a hurry, they can be found for a very reasonable price. I kept a small gold piece laminated in card stock for testing purposes when considering a purchase. They can be sensitive enough that just the salt content from waving the hand over the coil would cause a reaction to the audio. And of course always took headphones too. The GoldBug was also popular back then.
It took me a number of trips before I found my 1st nugget. There are some real spiffy machines out there nowadays but I'm not into it enough anymore to get all those fancy things. I also kept my all my pans and a nice Keene sluice, plus all the shovels, picks, hammers etc. I just have a couple spots I go to once or so a year with the wife, dogs, and take a couple tag along kids. Mainly just to get out for old time sake and sometimes see some color. Kids can really enjoy it as they can get all wet and dirty. When working a pan, always keep an eye for stones too.
As far as detecting, and can go for hours for only junk. Here in California, I'd sometimes find the old boot tacks etc, looking for spots where they were. Other times I would swing up around the hills away from the creeks as hours of panning isn't always kind to my back.
I few fella I went with then all gave it up. It just wasn't enough for them I guess. I guess they expected hits and finds as often as coin shooting.
I have a few other machines that aren't dedicated gold machines. The thought has crossed my mind to sometime maybe give them a shot. Example, my Vision has a prospecting mode. Others really like the MXT. I guess it's all in what a person wants.
Look around, read up, check into the prospecting section - but myself, I would keep the Silver for purposes other than nugget shooting.
I know some don't, but I always had to use quality headphones.
And to be honest, I spent more time panning and sluicing than swinging a gold detector - so others would be way more up on this stuff.