Nan is a good flat bread. I always like garlic nan. You can use it like a tortilla with whatever other foods I get. Tandoori is probably the least radical departure from America food. Its like a fire roasted chicken but a bit drier. Chicken Marsala is what my wife likes and she isn’t very adventerous. It has a mello tomato creamy lightly spicey taste.
My favorite dish is Lamb Saag (Saag is just a spinach based sauce).
Provided you like spices especially curry you will thoroughly enjoy Indian. I’ve been lucky since I work with many native indians I’ve had home cooked Indian meals and they always recommend the best restaurants.
Thanks!
Mark