A lot will depend on the quality of the topsoil. It should not need the peat moss, but the compost would always help. Al

Ok, thank you Al.

bobby

Well peat moss is essential for my raised beds. To suggest not using it without knowing intent is bad advice.
What you're growing can influence what is best to put in the bed. Compost and peat, which is a form of compost, will eventually breakdown and have to be replaced. In most cases this is not a problem, but say you plan on putting trees in the bed, probably a bad idea to use peat and compost, unless you mound the trees in the bed.
Still a bad idea as the roots will not grow well outside the bed, thus limiting the tree's potential.

I'm also not sure why you want raised beds? This can influence what you put in too. Unless trying to keep gophers out, I would mix in some native soil from the bottom. Break it up, add some soil and mix it. So you don't have a clear change in soil. That the amended soil slowly turns to native soil on the bottom. This way plants can grow well past the bed into the ground. Such as tomato plants which can grow roots 4 feet long.
For blueberries I use peat and pine bark fines. For veggies I use Garden soil, peat and compost. Top soil is the poorest soil around. I would not use it. It's cheap, lacks nutrients, and is fairly useless. Well I like to use it to fill holes in the yard, etc. For trees I would use native soil, and maybe top soil if you don't have enough native soil. You really want the bed to match local soil for trees.
If money is an issue, you can use top soil, just add 1/2 compost, 1/2 top soil, and it should be decent.
I like using peat, but it is probably not a good idea in the south or the west. It becomes too dry.
I only use a small amount of peat 1/5 of total at most.
I'm in the Midwest. I also add some kind of mineral, rock phosphate, azomite, green sand, maybe Iron tone. I like to add a bag of worm castings too, and some cheap organic fertilizer, like alfalfa meal.
Here's some of my raised beds

I want to clarify whar Drew said about topsoil. I believe he is referring to topsoil that you would get from a soil company. It can be highly variable. Some places make very good 'topsoil' and some places make junky 'topsoil'. Topsoil just means the top layer of soil. It doesn't say anything as to the quality of the soil. However, 'topsoil' is often used to refer to good loamy soil and that is what you want.

What you don't want to do is fill them with straight organic matter like a potting soil. You also don't want to go crazy with the organic matter. Assuming you don't have much organic matter in the native soil, 30% organic matter by volume will put you right in the optimum range.

Now I know there are plenty of people that will get a little bent out of shape about this, but I think it is important. Get your soil tested and find out what your nutrient levels and organic matter levels are before you start adding stuff willy nilly. A little money spent up front can keep you from buying stuff you don't need.

I'm wondering why you are thinking about raised beds. Unless you are sitting on gumbo clay, caliche, hardpan, or some other major soil problem, I think they can be more trouble than they are worth. Accessibility issues are also a good reason. It seems like people think you have to have raised beds these days since the garden mags and shows push them constantly.

Some very good points Nil. I myself use them for blueberries because our native soil is too alkaline, and I can control PH a lot easier in a rasied bed. I also use them to control the spread of raspberries. Although it doesn't work that well, they go everywhere anyway!
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The beds also help keep my dog out of them. it was easy to train him not to go into them. Harder for him to understand my in ground areas. i fenced those off so he cannot enter.

I hadn't thought about dogs. That makes quite a bit of sense. My dog thinks the whole property is his. Those farmdog/herder breeds like to be thorough when checking things out.

He's worth the trouble as he keeps most things away from the fruit. At least the squirrels. the birds are tricky, and do steal fruit. It's worse this year, had to resort to netting the strawberries. The robins discovered them after 3 years, and now will not stay away!

Bobby: I'm wondering what you are going to grow and why you are asking this question in the container gardening forum? It's not a container if it's open to the ground below the bed. Ideal ingredients for a container and a raised bed are different.