@AC banging on about home and end keys!
You sir, do not know what you're talking about. I'm sitting here on my Mac (I have sony, HP, acer and toshiba laptops in my flat as well, so I've actually used more than one type). My MBP has Home, End and Page UP/Down keys clearly marked on the keyboard (albeit not as dedicated keys, you need to use the apple key and appropriate arrow key, but they're there).
As for Delete, I can press function backspace for that (I can also press alt-backspace to delete last word, or apple backspace to delete to beginning of line). Just because you, as someone who it would seem hasn't ever used a Mac can't do it, doesn't mean it can't be done (please also, stop fully capitalising the word Mac, I know you've read the word MAC capitalised on other web pages, but they were likely talking about Media Access Control addresses, these are different things).
As for the highlighting thing, you don't (even on a PC) have to use the Delete key, you can use the backspace, or simply type your new word in (the highlighted section being replaced by the first key you press.
Finally... on the crashing front, well, all I can say is the Macs I use are very stable, I close the lid, they sleep, and when I open the lid, I continue where I left off, no problems. I've never been able to do that quite so easily with a Win or Linux PC (the number of PC's I've pulled out of my laptop bag at home or work that are cooking themselves because they haven't entered sleep mode properly is... well, a lot. That doesn't happen with my Mac, close it and put it away, ready for when I need it again.
It is that just working thing that I think _is_ value for money... I've used windows, and it just wasn't flexible enough for me. I used Linux, it's _far_ better, however, I'd have to spend too much time getting my laptop to work. Desktops are better for linux IMHO, I just didn't like the amount of time I had to invest to get a new laptop, with unsupported hardware (because the laptop used a new chipset, and the vendor didn't offer good linux/open source support), etc up and running. My Mac gives me the power of unix, and the simplicity of an integrated solution (and a more realistic product than a SparcBook!). It ticks the boxes for me, saves me my time, which I value.