You can try a Trimline, Saturn, Comfort, or Creekline. They are all similar as far as assembly to the slimline, but thicker at the middle. The next level up would be something like the Sierra (Wall St., LeRoi, Gatsby. Similar pens have different names depending on where you buy them.) You could also look at the bolt action, Celtic, or some of PSI's other theme pens if that strikes your fancy. Up from there are Roller Balls and fountain pens. Usually they cost a bit more, but if you follow instructions you should have no problem with them.