The 10 and 25mm are a good start, assuming they are good quality plossls, and not the "super" EPs from the SW line:
http://skywatchertelescope.com/ProductsEY.html (the silver ones and the "super plossls" are good)
In addition to what you already have I'd grab a 15mm or 17mm plossl and a 2x barlow also (GSO is the cheapest one that works okay). 15mm will be near ideal for deep sky, and barlowed it will be great on planets. Cannot recommend plossls <10mm because of short eye relief, ie poor comfort.
btw, for everyone else: scope in question is an 5 inch f/7.7 newt.