I've never brewed a Saison, and can't remember the last one I tasted, so I'm not sure what flavor profile you're looking for. I have a bad habit of adding and adding and changing and changing, so I would add a 1/2 oz of dry hops out of pure compulsion. Anything under 3 oz of hops total probably won't get you in trouble.
I have no idea what hop you could use. A floral/fruity hop like cascade will go well with the wheat grains and honey malt...but not so well with your darker, chocolaty malts. Experiment and see what happens. OR EVEN BETTER, move half your batch into another carboy, and toss in some dry hops in one of them. Just remember to keep your ratios in check (1/4 oz hops in a 2.5 gallon batch will equal 1/2 oz hops in a full 5 gallon batch).