The Casio WK-225 is a 76-Key Touch Sensitive Keyboard that can be used for learning, for its accompaniments, and is portable enough to be easily carried around. The 76-keys lets you practice many more songs compared to 61-keys. If you're looking for really weighted keys, you may have to explore other options.
Pros Affordable, 76 Touch Keys, Easy to Use, Power supply included
Cons No Weighted keys
Best Place to Buy On Amazon, Casio WK-225 for $180-$220
Who Is It For? If you are a beginner, who is keen to learn & play more of piano pieces, and would like to have several voices & accompaniments, and do not have the budget for an authentic 88-key keyboard, this can definitely fit the bill.
Intermediate players can also find this of use, as it comes with a 6-track recorder which you can use for recording your creations, has audio inputs for connecting an MP3 players so that you can play-along to your favorite tracks, and has USB midi port so that you can connect it to a computer and work with various music software.