"DH leans towards a good PC as he finds Mac expensive"
Apple don't make low quality machines, if you try and find another computer with exactly the same specification and build quality you'll soon find yourself at the Apple price level.
So yes they're expensive, but they're very good.
"Are they more durable than PCs?"
I find that they are. Windows PCs do tend to get clogged up and they do have a habit of slowing down, even older Macs are still usable after years of service. So again that's something to consider when it comes to price, they can last longer. But that does mean you don't get a nice new machine as often :)
"we have to buy software on the top of the computer"
You can download various free pieces of software that are pretty compatible with Office, but your mileage on that might depend on exactly how complicated your Office/Word work is.
The big downside of Macs is gaming, which you say you don't mention so that's not a problem. Software in general can also sometimes be a bit of a problem, not all gadgets come with Mac compatible software, though it's becoming much more common as Macs become more popular.
A big upside you haven't mentioned is security. Macs are more secure than Windows machines, you don't need to worry (yet) about anti-virus software and you're not engaged in this almost constant fight against the hackers. So Macs are much easier to look after in terms of software maintenance. Windows takes work to look after properly, which is another reason why for many people it slows down over time, it's not looked after how it wants to be.
So yes I think Macs are great, but they're a luxury.
I work all day on Windows computers, I know them really rather well and they're a great tool that I can make do all sorts of impressive things. But for my out of hours computing when I don't want to have to fight the computer I like using Macs.