The AF-S DX 35mm f/1.8G is one HECK of a good lens for indoor / low light, no question. I have this lens, and I'm a big fan. Not sure how it would be for landscapes, although Anbesol is much more knowledgeable than me, and says it would be within the focal range. It’s only $200, and you said your budget is $700, so that would get you a great indoor lens with another $500 to spend on something else. It looks like you can get a Tamron 10-24 for around $500, which Franglais says might be ok, and he is also much more knowledgeable than me!

Sometimes you just need more than one lens. I hate changing lenses, but no one lens can do everything, and indoor / low light is pretty different from landscapes!