My parents bought me one next to theirs, but when I got married they sold it.
I don't like the brass plaques on the ground. It's done to make groundskeeping easier. My parents' graves are that way. I don't care if my gravestone is a PITA for the weed-whackers, thank you very much.
I want a real gravestone. A nice ornate gothic one.
We've got a cemetery down the road from our house like that, with real gravestones. Some of them are quite unique. What's especially fun is that some people have placed solar LED lights on the stones and on the plots, so you can see the eerie glow of them at night as you drive by. Nice.