Hi Karen, I'm not sure what your tastes in music are but if you're at all interested in 'new-age' sounding piano then I'd highly recommend looking at one of Ludovico Einaudi's sheet music collections. The 'Best of' collection of his is currently the only music book I own so I'm not really able to suggest anything else, but there are many pieces within this book that be suitable for a beginner/intermediate player. You'll notice that his music is very popular around here and there is a large Einaudi thread where you'd be able to get specific help if necessary.
A lot of the songs, although maybe a tad tricky to start with, are easier to play than they sound (which is always good for impressing people
)as they often consist of repeating patterns - so once you've learnt one section you'll find it much easier to learn the rest.
As I said, I'm not able to suggest anything else at the moment....in fact I'm eager to see what other people suggest so I can start to get an idea of what I can ask Santa to bring me next month!