Me? The Garmin eTrex Euro (simplest of the range, about 100-130 euros these days), data cable, serial to USB converter, OziExplorer with self-scanned Jeppesen maps on the laptop. I already had this setup before I started flying and it still serves me well.
High end would be a Garmin 496 or 696. Or anything in between. I also heard good stories about Avmap.
What's more important is that you know the device inside out, and know the limitations of your device. And always have a backup plan if the device fails.