Navbox Proplan is excellent - I used it to load up a handheld GPS but now that's just a backup in a bag, I use it to generate the plogs, handy A4 throwaway maps showing the whole route, and ICAO flight plans - a great timesaver just for these functions.
But if you want to spend say £300 plus, have a look at the Jepp Flightstar software. It seems to have some interesting functions; I saw a demo recently. The Jepp database is reportedly full of errors though.