If memory serves me your HR 28 will be mooring in Charleston harbor?
I'm not at all a fan of using anchors for a proper mooring. There are some that get away with it but they are in very protected waters, not somewhere with up to 4 knots of current.
We keep my Tartan 27' on the Hudson River where there is up to 2 knots of current. We use a standard mooring of 250# mushroom anchor, chain that will hold the QE II and mooring ball and pennants. We have weathered two named storms this way; Irene, Sandy. My boat weighs about the same as yours. A better anchor than our generic mushroom anchor is one with a counter weight, like this: Anchor Mushroom 250Lb with Counterweight Made In USA
And even more highly regarded are the pyramid anchors which necessarily weigh a bit more.
I would consider using 2 anchors if I had to anchor overnight in my river that flows two ways but I would never consider it a proper mooring for my boat. I'm not in a mill pond either. The expense of a good mooring can be amortized over the years you use the boat.
A few of the big chandlers have example mooring set up information pages. Jamestown is one of them. Mooring Basics - How to Install a Permanent Mooring
don't cheap out on your boat now!
More importantly, how much fetch, or open water is there where you intend to moor/anchor your boat?