Hi there !
I think Atkins recommend Hass avocados. I don't know where they're from, but they are the dark ones.
Make a salad with salad greens (try diff sorts, - iceberg, ruccola, baby spinach), yellow bellpepper, spring unions,avocados and fried bacon (in cubes or strips cut into pieces) mmmm I'm getting hungry already. I cut the avocado meat into small cubes, sprinkle with lemon juice to prevent blackening. Jummy...... ( I can eat just bacon and avocado alone as a meal/snack, mmmmmm it contains 0,5 grams of digestible carbs pr 100gr)

Guacamole can be served with anyting really, from Dr. Atkins New Diet Revolution page 399:
yield: 2 cups, 8 servings

3 spring union (white and 3cm (1in) green part, chopped
1 jalapeno pepper (or 8-12 slices of bottle jalapenos), seeded and finely chopped
1 medium tomato chopped
2 ripe avocados
1 tablespoon fresh limejuice
2 tablespoons fresh coriander
salt

Place unions, pepper and tomato in a medium bnowl. Slice avocados in half lengthwise, remove pit ans scoop pulp into bowl with a spoon. Mash mixture with a fork.
Mix in lime juice and coriander. Salt to taste.

Total carb pr serving: 6 grams, count only 2 digestible carbs when doing atkins, protein 2 grams, fat 11grams, calories 121

the best thing is to get the book and also the Dr. Atkins New Diet Cookbook. I could not have survived the last few weeks without it.

Good luck

Hass avocado = California avocado