Rather than one of the expensive, distracting, GPS units, I would recommend the NATS Aware item. It costs less than a couple of hours flying and will keep you honest by showing where you are on the same half mil' map you are flying with plus it beeps at you if it thinks you might be about to infringe. It doesn't do anything else (unless you buy some extensions which rather defeats the object of the thing) so doesn't encourage you to be head down when VFR.
PS I still do most of my navigating by looking out of the window!