Skymap IIIc - Great, screen size is decent, but not as easy to see airspace as on the 496. I use both and would reccomend both highly.
Flymap is absoluteley great, good screen size, touch screen and uses standard CAA maps (1:500k or 1:250k - and you can have street level gazeteer too if you want) there is a very handy forward looking terrain feature which will indicate if your current flight level is sufficient. Also has the Pooleys airfield database loaded. - Pricey though!! - Used one of these in my last machine.
Joel