we all love to spend other peoples money.
the Astronomy 2013 Ephemeris should be on the top of the list.You can buy it from the IIS shop. It's a month by month guide of what's happening up there. PLUS it has a beaut set of star maps in the middle, that you can remove and laminate so they don't get all wet with dew when using them outside.
Do you have a barlow lens?
More eyepieces would be good too.
You should check out
http://andrewscom.com.au/ Their 2.5x ED barlow is very good for the price. And the GSO 15mm Superview is my favourite ep in my collection.