This may sound like a stupid suggestion.
could you not go online and print off approach tiles and store them on your kneeboard and then get a low cost gps like a garmin 196 for example. It does everything the same minus the colour screen and approach tiles. You could get a used one off ebay for £200, and have £1600 of lovely avgas to burn. I know what i'd rather.
I worry with the GPS doing and storing everything for you. Does it make the planning stage much easier? well yes is does, but is that a good thing? If it stopped working and it had your only copy of the approach tile on it, what would you do?
But thats just my thought.
jon