A few suggestions: 1. If you are upgrading from the kit lens, my first pick would be 20mm f/1.7. The Sigma 60mm would be too long and you will likely get very little use out of it. 20mm pancake would be an ideal street lens for its low profile and the focal length. I would not go with 14mm. I had one and it felt too wide. 2. If you are buying the pancake lens, my recommendation is not to buy any other lens for at least a few months. You can cover most of your needs with the help of your kit lens in a pinch. 3. The Oly 40-150mm is overpriced at $200. It had been at $99 brand new for over a year until the recent price hike a few days ago. Either buy used or wait. 4. If going with 20mm, there is an older version of the lens that is optically equivalent. If opting for used, you can get it as ~$100 cheaper here http://www.amazon.com/Panasonic-H-H020-Aspherical-Pancake-Interchangeable/dp/B002IKLJVE

Good luck! My first few years into photography, all I had was a refurb D3000 and a Nikon 35mm f/1.8. I still cherish many of the photos that I took from that time.