Your post doesn't indicate whether you plan to get the nib modified by a nibmeister or if you plan to use it in a pen with silver colored furniture; in my conversations with Mr. John Mottishaw, he indicated that the older, single colored nibs were better for a flexible customization. Barring that type of customization I would say that it is just a matter of preference. The single color gold nib would not look aesthically pleasing in a pen with silver furniture but some people aren't concerned or bothered by that. Hope that helps.
Greg~
QUOTE (barny @ Aug 3 2008, 01:17 PM)

If you were to replace or buy a new Pelikan 14k nib what will you choose between bi-colour & the single-colour nib?
The bi-colour is a bit expensive does it mean that it has a much precious metal in its construction? (sorry for the basic question but i'm just curious)
thabks