The Gillott 1068 is a must-try! It's a fairly sturdy nib, also lovely to use when you're an advanced beginner. There's not a lot of difference between the thick and thin lines.
Suitable nib holders: all pen holders with flexible metal mounting.
Shipping costs NL&BE: €4.95 & Free shipping when you spend €50
Shipping costs DE: €6.95 & Free shipping when you spend €100.
(for orders under €10, shipping costs are €7.95 (BE €9.95))