The Curry Leaf in the Bethany Center in Portland has wonderful Indian food at very reasonable prices. Their nan bread was absolutely wonderful. They have a nice menu selection and the service is very good.
There is a display kitchen, so you can watch as the chefs prepare the food which is kind of fun. The atmosphere is light and contemporary and when we were there, it really wasn't very crowded. I've been by a few times and seen a buffet, so check their web site, because they may have details on specials and when they have the buffet.
If you live in the Bethany area, you are right around the corner from wonderful Indian food. Check it out!