Check out the Garrett range. Great units , I bought the AT Pro and love it. Found a few treasures in the bush, but not tried in the sand. The at pro is waterproof , and is suitable to use in all areas..
It took me a couple of months to make a decision , my criteria was similar to yours ~$1000 and not needing to have a degree in Astro physics to drive it.
As someone else said, check out the dirtfisihing forum, great bunch of guys and most are happy to offer advice, just like the electrical section here...
What ever you choose, just like a CT , get out and use it....
Cheers Jason