Me and my Girlfriend have been going to Udupi for the past 5 years with little or no complaints. The food is always high quality and the price is lower than most other sit down Indian restaurants on the Tempe/Scottsdale area.
Now that found out I am gluten intolerant the Gobi Manchurian is out (which is my favorite dish). The menu is very easy to navigate if you require Gluten Free options, the waiters are also very nice and will help accommodate almost any dietary concern. I also recommend the spinach dosai, extrra hot if you can handle it.