0.5mm tips, so if you are worried about that, stick with 0.7mm.
PaperMate InkJoys or anything, just small little ones, and they still dried so fast that they didn't smudge or smear, which is usually the main concern with blobs.
The Pen Addict - Orange
The Pen Addict - Purple
JetPens - $2.50
These pens are great looking, really smooth, super easy to write with, and come in an array of very pretty colors. While they are not cheap, they certainly are a pleasure to write with and having a whole set of colors of these will tickle your heart. Unless you hate ballpoints, you best pick up one.