[dwringer]

The Decimo is a great form factor, it's also just about the most inconspicuous fountain pen possible so you won't get weird looks from people who've never seen a fountain pen before. That said I have one as well as a Custom 74, both in EF, and somehow I like the 74 a lot more in that size. The Decimo nib seems finer and is noticeably softer (18k vs 14k), and I'd prefer it with a medium nib for maximum smoothness. I think it also dries out a little bit, something that I've never had with the Custom 74.

On the other end of the spectrum I have to recommend the Lamy Safari and Kaweco Sport for their utilitarian design and timeless aesthetics.

[slowmovintarget]

The award for utilitarian and timeless has to go to the Lamy 2000.

The Safari is very good as a starter (though I'm partial to the Pilot Metropolitan or TWSBI Eco for starters). I don't have experience with the Kaweco Sport, though I hear only good things.