If I had to chose one, it would have to be the Rotring 600 in 0.5 lead. I've tried the 800, and the retractable tip is nice in its own right but its added weight and complication lead to the entire pencil feeling less balanced and cohesive. The 600 on the other hand, is very nearly perfect. Nice to hold, nice and weighted, and has a certain beauty in its simplicity. The erasers are quite chunky, a huge upgrade from the tiny ones in Staedtler's 925-05. The grip is not overly aggressive, but instead to a degree both comfortable and suitably grippy. I've tried a lot of drafting pencil over the years, and this is the one I was most enamored by. It is quite ironic, however, because I have never used this pencil for any kind of drafting. I use it almost exclusively for writing essays, notes, and stories here and there. It performs admirably, and not to mention looks awesome doing it. I do however lack a nice ballpoint or roller ball pen in my set up. Any recommendations?