Priming ideas?

Hi,
I have 5gallons of a light Belgium Pale Ale for a local homebrew competition. It's nice i like it but i would like another level of depth in there. Does anyone have any good ideas for priming a ten litre keg? Something to add another edge to it.

I have palm sugar
Table sugar
Dark sugar
Honey
Golden syrup and treacle

The beer was brewed using ;
Pale malt
Pils malt
Abbey malt and crystal
Styrian goldings and whitelabs belgian ale yeast

I would honestly just bottle with maybe some of the golden syrup. That should work pretty much just like bottling with corn sugar. This will keep from adding any real additional flavor and just let the Belgian yeast shine.