I have been torn between the Sigma 105 and the Tamron 90 2.8 lens.
For knock around I have been been trying to figure that out for a while. I have a Sigma 18-250 I bought when I first got started and it works, but I would like something sharper.
For wide angle I love my Sigma 10-20 f/3.5 and I think it spends more time on my camera than anything right now.
The Sigma will give you a little more working distance between you and your subject when compared with the Tamron. Jake uses the Sigma 105mm f/2.8 OS and has stated many times how pleased he is. I bought the Nikon 105mm VR when they had a really good price on it--otherwise I would have bought the Sigma instead.
Scroll halfway down this page of Jake's Flickr images to see his snowflake shot (it's right below those amazing frozen bubbles he captured with a different lens).
EDIT: Just noticed only the first bubble shot was taken with a different lens. The two other frozen bubbles were taken with the Sigma macro.
https://www.flickr.com/photos/backdoorhippie/page6
To answer the OP's question, I'd recommend the Sigma 105mm Macro for the same reason I just mentioned.
For the other choices, since you are using a DX body, you need to decide whether you want to buy DX or FX glass. If you know for sure you will stick with DX, there are some great DX lenses out there. The reason I'm saying this is because a wide angle FX lens isn't all that wide on a DX body. 18mm on DX translates to 24mm FOV on FX. So if you are looking for a true wide angle perspective, then you might want to look at ultra wide angle lenses that are made specifically for DX.
Then as an all-around lens, one of the 18-xxx zooms should fit the bill. Since I've never used them and don't know which ones are better, I'll leave those suggestions to others who know more about them.