My favorite pen for a long time has been the Uni-ball Vision Elite Bold. It is a rollerball pen that is very smooth writing, and easily visible in the bold choice. I have a collectibles indoor flea market booth, and have to write a lot of price tags, and I have found that this pen is perfect for that. I prefer black, but it also comes in blue, as well as a combination pack with other assorted colors.
My elderly mom and I love this pen so much, that we fight over it! (Not physically.) But we do actually get very possessive of our pens, and she has been known to write her name on a piece of tape affixed to her pens, so that we do not get them mixed up. (I often borrow a pen from her when I visit, and am writing at the kitchen table.) She absolutely loves the bold rollerball pens for writing grocery lists and checks.
About the only complaint I have about these pens is that occasionally they may smear. So be careful, when signing greeting cards or important documents, to let the ink dry thoroughly. I have also found that it is best not to sign credit cards with rollerball pens, because of smearing.
Other than that, you will find this to be the perfect everyday pen!