Another opinion
I own a couple of books and anchoring, rodes etc and read most of what I could find on the net including a couple of forums.You will find there are "working" anchors and "storm anchors." Working anchors are what are usually recommended when you see those charts telling you what size to buy. Storm anchors are larger puppies for that really big storm with your name on it.Next there are different characteristics for anchors, some are the "best" for holding power, others are the "best" for setting quickly. Setting quickly is important for me in the Pacific North West and coastal BC where there can be dramatic drop offs quickly along the shore; so I want the anchor to set quickly, especially with other boats hugging the area as well.Next, you really need more than one anchor so another "best" is what holds in what bottoms the best. The Dela plow, the Danforth and knock offs, and the Fortress are set well in identical bottoms. The Bruce is the "best" in a really soft bottom.So minimally you should have two anchors on board but many folks will have three or four. My boat came with a Danforth and a Bruce, but on the smaller side of the chart recommendations. My boat is a Catalina 27 and basically the same as yours (for anchoring purposes). I bought a Delta 22 pound anchor with 1/4 inch chain - 30 feet - with 250 feet of 1/2 nylon 3 stranded rope.Now if you do your research, you'll discover hardly no one knows what they are talking about when it comes to chain to rope length in a combined rode. Some say the length of your boat, others say the chain should weigh as much as your anchor and almost twice as much if the anchor is aluminium. Others say a short amount such as 8 or 10 feet. The problem is everyone is repeating what some one else said, with no one doing their research, including the guys that wrote the books.There is one site on the web with good research on chain/rope rode; he recommends 40% chain and 60% rope. The good news for you is that if you follow this recommendation, you will not only be purchasing anchor, shackles, chain and rope, but windless and battery and line to install it and you will be looking at a pretty serious bill.So back to the drawing board. I personally am following roughly the rode being the length of your boat. Chain length has been shown to be better than a kellet (extra weight slid down your rode to add weight to keep the angle of the rode to anchor down). But chain is very heavy so if your chain is too long (too long is when you are in deeper water and you add the weight of your chain to the weight of your anchor as you pull it up, then square (times two) the pain in your back as you pull it up, and you have the proper equation).So if I have a 22 pound anchor and I'm anchored in thirty five feet of water, when I'm pulling up the anchor and chain, I'll be pulling up around 64 pounds of weight (22 pounds of anchor with 30 feet of chain being around 42 pounds - proof coil). If I run into this scenario I plan on using the winch to get some of the chain in to reduce the "pull" on my back, thus square rooting the pain.One chap said that the best size anchor is one that when you put it on your boat, the rest of the marina laughs at you; this would be a good storm anchor.I would recommend you get 2 anchors; something plus a Bruce or Bruce knock off. Personally I wouldn't use a Bruce as my primary anchor, but you'll get lots of testimonials on the efficacy of a Bruce. But I would use the Bruce as my primary in a soft bottom. I would use the "something" else as my primary and Bruce as back up or second anchor.In my case, I use the Delta #22 as my primary, the Danforth as my second and stern anchor and the Bruce as my back up, and primary in soft bottoms.