You have to define better what type of pen you mean:
1. ball point
2. pencil
3. rollerball
4. fountain pen
Everyone here has a certain preference and I will tell you mine.
1. I like the double twist type pens from Berea, especially the American style Flat top pen (so-called Parker style), and I tell you why:
the twist mechanism is the very best I ever came across, it is very long lasting, I have a pen in daily use now for about 2 years and I am one of those who constantly play with their pens, like twisting the refill in and out all day long.
This pen can be easily repaired if needed.
My second choice is the Perfect Fit Convertible pen also from Berea, here I also like the smooth mechanism and the choice of using it as a ball point or as a pencil, just by changing the mechanism
2. pencil, see before the Perfect Fit Convertible as a pencil.
Have not had much luck with pencils that have the clicking mechanisms
3. For a rollerball my first choice now is the Baron, I think it is at this time the best kit on the market for RB's. This is closely followed by the Gent-type pens (the juniors and the seniors and their off spring Statesman, which I have not used yet). Also the El Grande and the streamlined version are very nice, although the latter one is not an easy pen for beginners.
4. Fountain pens, see what I said for the rollerball section, all of these pens are available as fountain pens. One other kit comes to mind and that is the Regency Fountain Pen, this I think is a great kit, but it takes a lot of work and not too many here or on the yahoo site have made those. Reason for this is there are no bushings available, they have to be made yourself, also the section part of the pen is wood and the two end finials (cap and pen body) have to be made from wood. The one thing I do not like on this pen is that it is a snap cap pen, and I do not like snap caps.
This was pretty long, but I think it gave you a good idea!
Rudy
SE Michigan