I'd say Chocolate... but sometimes I have a hard time ID'n Chocolates, because my Chocolates are darker than what most everybody else breeds/hatches, and so that keet looks a lot like my Blondes. Could be a male Chocolate (if it's not buck-wheating), they are usually a little lighter than the Hens.
(I need to get some pics of my Chocolates and Blondes now that hey are molting into big bird feathers!)
Yeah, Blonde was another thought I had. These guineas are from McMurrays. Not sure how much probability of getting a Blonde from there are, but there may be some. I have no idea if this one is buck wheating... I did ask though so I'll let you know what she says.