If it was just coming to head-fi, DN HP-700.
If it was joining, HD 25 Aluminium.
My first purchase after coming here was a Sony MA900 for a friends birthday.
I'm looking at the New Oppo, AKG, Audeze's and more at the moment to see if I want to pick up anything else for my little collection.
I think it was the X1's, they took forever to get though so basically you could say that the K1ks were the first headphones I actually got after joining Head-Fi. Maybe not the best entry-level phones when you don't even have a solid amp