Can't believe it took this thread to page 3 before anyone mentioned JetPens.
Actually, there is a large group of people who blog about pens. Top of that heap is Brad Dowdy, who writes PenAddict. In fact, he's done such a fantastic job that he got hired by JetPens to be their social media/marketing guy. Brad is a super-friendly guy and has reviewed a ton of pens.
I am addicted to retractable gel pens. If you have ANY questions about any of them (different manufacturers, pen thicknesses, etc.), ask me!
Here's a photo of the pens I keep at work (I have more at home):