I've got Navbox Proplan and like it a lot. At first sight there's a bit of an "is that it?" feeling - there doesn't seem to be much to it - but it does everthing I need. I've noticed a couple of minor problems with the database (e.g. a couple of the bits of CAS around Southampton/Bournemouth have the wrong base) but nothing major. It sends the planned route to my GPS-III and downloads the actual track flown without problems.