For vegetarians, there are other options. My personal favorite is Masalaa, a completely vegetarian south Indian restaurant located off I-25 and 225 south of the city -- although I'm not finding it in a search, and definitely hope that it hasn't closed. I'll have to do some field work. Here are some others: http://www.vegetarianusa.com/city/Colorado.html
Another really great option, if you enjoy Nepali and north Indian food and want a nice day trip, is http://www.nepalidining.com/ The Kathmandu Restaurant in Nederland. This is - IMHO - THE. BEST. Nepali restaurant in Colorado. Set in the mountain town of Nederland, 25 miles into the mountains outside of Boulder, it makes a great side trip. They have a mid-day all you can eat buffet which includes some meat items and many vegetarian options, or you can order off the menu. We've been fans since they were located in a tiny space in the Wolftongue Square which now houses a small bakery restaurant.