The ACE 250 does poorly on the wet salt beaches in our area Becky (I'm in Salinas, 45 min. from your beaches, so we hunt S. Cruz all the time). The Ace 250 doesn't handle the mineralized wet salt. It would be *
ok* on the dry, but once you go on the wet salt, you'll decrease down to 5 or 6" max. A better choice would be the an Excaliber, CZ6, Explorer, etc... (depending on various factors of your tastes). Or if budget is an issue, the 6000 Di pro. does well on our beaches (both wet and dry) and can be had on fleabay for fairly reasonably, since it's been out for 15+ yrs. (make sure it's the "di pro" version, and not the earlier versions).
If you want to try a loaner of various options, you can probably hook up with some locals who've got spare machines to sample, compare flagged signals, etc...
The the wet beach up your way can be good when a south swell combines with high tides. That erodes the wet, and mother-nature can turn her beaches into a natural sluicebox

Contrastly, when the sand is "coming in", it can be seemingly sterile. Get on the kinzli CA forum, and there's some S. Cruz area hunters who post there. To get to the main page, you have to sign up. But it's easy: just make a name and password, and you're on.