Don't forget you'll need an amp or plan to play through ear phones.
I'm honestly surprised that nobody has suggested Roland. They make very nice keyboards at a wide variety of price points and i must say I have never been disappointed by mine.
If I didn't require a nice speaker cabinet and so forth, I would have probably got a Roland FP-4f. It's the most inexpensive variety of their "SuperNATURAL" line of pianos. It is basically a keyboard, it is very compact and sits on a stand, but has the SuperNATURAL brain. Same brain as my HP-302. With a nice set of external speakers or headphones, I'm sure it'd be excellent. Might be out of your price range though if you're looking for any old "keyboard." Privias are pretty good for the price, about half the price of a Roland FP-4f. Noisy action though.