As another paleface, although not as light as you are, i vote for the Guerlain.
I got the Guerlain Terracotta 4 Seasons Tailor-Made Bronzing Powder in
Blonde on eBay. It was expensive but i paid only about 2/3 of the original list price, and i am convinced i got the real thing, because the quality is astonishing - both of the packaging and the product. I don't normally wear bronzer, although i own a few that i don't use - got them a few years ago when bronzer was new to me - before i realized i am not a fan of bronzer in general.
Terracotta 4 Seasons has FOUR colors in one pan, which is divided into quadrants, and the cake is HUGE. This way you can easily use one color or blend however many you like. They are all matte, which is so much more useable than shimmery/glittery ones (and i LIKE glitter - see my sig). So it works for contouring as well as bronzing, which many bronzers don't.
And, as i said, it's huge. I know mine will last me a lifetime - i'm over 60 so i probably only have a little over 30 years to go