Adonit's Jot styluses are consistently among my favorite pens for the iPad. The great design, solid construction, and innovative pen tips make them a pleasure to use.
The Jot Touch 4 is their current high-end model with all the latest tricks (pressure sensitivity, palm rejection, Bluetooth 4). It is my current favorite on the market and here's why.
Adonit launched their Jot styluses on Kickstarter in 2011, and I have one of the first-generation Jot Pros from backing the project. The company has since gone on to improve the design and create other models, such as the pressure sensitive Jot Touch.
The Jot Pro, though it lacks the bluetooth capabilities of its higher end counterpart, is still a wonderful stylus in its own right. If you're looking for a stylus alternative that doesn't cost you $80+, you might want to give this one a go. The ballpoint pen-like tip with the plastic disk is truly unique among the major stylus competitors and offers better accuracy and experience than the typical rubber nibs out there.
The Wacom Bamboo iPad Stylus is one of the top styluses I always recommend. It is well designed, feels great, and is not super expensive.
Super pros might prefer to get a fancy pressure-sensitive stylus, but if you're looking for something simple and good, this is the stylus to get. I even like it better than Wacom's high-end counterpart, the Intuos Creative Stylus (you can read why in that review).