Karen Kay Buckley has pins she calls "the Perfect Pin" in two lengths. They are the thinnest, sharpest pins I've ever used; however, the pin heads are tiny. They are a little pricey -- $8.95 for 45 pins, but if you want sharp, these are the pins to get. You can find them at LQSs and online stores, where they may cost less.
Other than the Perfect Pins I like the Clover glass head pins. They come in two lengths- Clover Patchwork Pin (Fine) are the longer pins and Clover Quilting Pins (Fine).