My all time favorite is TOMBO roller ball pens. They feel better and better as you go through the refill. If you have any complaints with any of their pens their customer service is incredible. http://www.goldspot.com/Tombow_pens/Ultra/T55069.html
I do have a Parker 51 fountain pen but it doesn't get much use anymore with everything being multiple copies. Excellent pen though.
Cross is also my other choice but the barrels are small in diameter.
"Peace is that brief, glorious moment in history when everybody stands around reloading". Anonymous
Earp: Not everyone who knows you hates you.
DOC: I know it ain't always easy bein' my friend....but I'll BE THERE when you need me.