On the driveway side, I will use a very small transformer and get power from the GFI near the A/C. Some might call this overkill for 1 or 2 lights, but in reality.. it isn't.
With the time it takes to run a wire thru a crack that will be exposed to sun and often cleaning chemicals and eventually shorting out ... the 50 bucks for a small transformer makes my install virtually trouble free. And I don't need to break out a concrete saw to clean out or widen those cuts in the driveway when the wire won't fit.
And never EVER put the gfi on your lightpost. Along with the problem that your garage fridge is likely on the same breaker, and a little problem kicking the GFI can turn into a freezer full of rotten food you were saving ....... You will still need to mount the transformer somewhere (on the post right?) and if mounted to code, it will be unsightly in the front, and breaking the protective coatings and paint on those posts, causing them to corrode and need replaced in just a couple years.
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