Nikon Lens Question

So I've got into photography after previously using just my phone and a Panasonic LX3 and purchased my first D-SLR a few weeks ago and now I'm looking at potential lenses to tie up with it.

It's a Nikon D5200 (which is awesome) and I already have the 50mm f1.8. This combo has been great but I find the 50mm a little 'too close' at times because of the crop. Experimenting with my kits lens has made me think I would like something either;

a) Like a 17 - 50mm f2.8 (like this or this)

b) Or a 18 - 105mm f3.5 - 4.5

c) Just get the Nikkor 35mm f1.8 for image quality.

The main things I tend to shoot are nature and street with a little wildlife thrown in. I wouldn't mind having a decent go at landscapes either but would the 35mm be suitable for this, has any one tried?

What's your thoughts?