Usually spices and sugars are best added in the last 5 mins of the boil. Cardamom seems a bit high. I use it at .5 tsp for 5G...but it's a pretty good spice. I also like a single split vanilla bean, but each to his own. That's why holiday beers are so cool; there really isn't a 'right way'
Edit-You can also put cloves in...be very sparing..a little goes a LOOONG way with cloves
If you find you don't have enough of one spice or the other, you can always add in small increments in secondary.