This guy on the left hand side: I prefer largish tips personally, as they heat the pad + joint quicker than the smaller/thinner tips. Thats pretty much your "standard" size, i have a hakko clone myself, and bought fake/clone tips from ebay. I have 3 types, and unfortunately that type i recommended doesnt seem to heat up properly, and fits loosely into my clone's iron. I think I may even be a longer version of it, but it sucks, with your genuine hakko and tip it will fit perfect. So im using this bevel shaped tip now: ...which is a bit tricky to heat both the pad and the Joint at the same time with. I kinda have it turned sideways, heating the joint, and the solder blob just about touches the pad, and i wait for it to flow onto it. An advantage of bevel shaped tips is that you only need a small bit of solder covering the flat bit, with the conical shapes you kinda have to rotate the tip as you tin it, and make sure its covered evenly.