Crown Heights and Kensington are extremely different neighborhoods. Bushwick is becoming an extension of Williamsburg; I have several hip young coworkers who live there. Have you ruled out Fort Greene, Prospect Heights, Clinton Hill, Windsor Terrace, Gowanus, Boerum Hill, Sunset Park & Greenwood Heights? I'm assuming you already figured Park Slope, Carroll Gardens & Cobble Hill would be too expensive, and maybe some of the other neighborhoods I just mentioned.