The earliest yataghans known date as late as the early 16th century, and they are in essence a long, heavily decorated knife (see the one in the Met, which belonged to Suleyman the Great). I think they have no place in the mod.
ShayanMirza, all the evidence suggests that it was actually the Persians, who acquired the sabre from the Turks, not the other way around. Even Persian-centric writers on the subject as Mr. Khorasani agree with this. Before the Seljuks the Persian swords were straight, and only later we tend to see sabres in the Persian miniatures, obviously brought there by invading Turks.
As for the typical Ottoman hilt, I think what is attributed to the Ottomans might actually have been a Mameluke creation. For a pure Ottoman sword, I think one needs to look at earlier examples and my favorite is the sword of Mehmet II Fatih, the conqueror of Constantinople. My feeling is that it is much closer to earlier Seljuk swords in blade and hilt shape than the 19th century swords people insist on posting in this thread.