I think I'm experiencing a little "hedonistic creep", or whatever they call it as I get older. For instance, I finally got an iPhone 4S about five weeks ago. I was happy, for the most part, with the ancient Motorola flip phone I had been using, except that its screen was getting hard to read, it had a little dead-spot on the display, and the silver keypad was hard to read. I could've just gone with another cheap phone, but now that I've made the leap to a smart phone, I don't want to go back.
I've seen it in other stuff too, like television sets, electronics, cars and so on. And one day, I'd like to have a house with more than one bathroom!
I don't know if any of this is really wanting the finer things though, or simply the baseline is creeping upward. Once upon a time, even a basic cell phone, or power windows in a car, or air conditioning in a house...or indoor plumbing for that matter was a luxury! But, now it's all pretty much expected.
I have started liking nicer clothes, I'm finding. But that's often because they're a better, more flattering fit, a more tasteful cut or design, and tend to last longer.