GNote owners have a wide range to choose from, including a cover from Samsung that adds minimal extra thickness and weight to the already large phone. Plus, the best cases take a cue from the Note's versatility and do more than just protect.
If you're more comfortable using a regular-sized pen, Samsung has an accessory that should please you. The $59.99 Galaxy S Pen and Holder Kit has both an extra S Pen and a Holder that makes it the size of a normal pen. You get the side-button functionality and everything, just in a larger form factor.