I'd add some allspice if I were you. It's a nice beer spice IMHO. Also, I wouldn't waste KG on bittering...get a bittering hop, but be careful: spices and hops can clash like crazy. I'd add your aroma hops 8-15 mins before the end of the boil, so as to subdue their effects.
Also, and this is a personal thing, but I'd add some chocolate malt to darken her up and add some roastiness to the mix.
Other than that, it sounds good!