If I may, we would prefer these clans in greater number:
Ventrue
Toreador
Tzimisce
Tremere
Elder concepts very welcome, as are younger. We want each of the above to have a distinctive power in the auction - whether they agree with one another in-clan or not - because there is so much content to draw on for conflict or grief/heartache around the fall of The Dream; the Crusades between the clans involved; the ongoing Omen Wars and the hatred the Tremere are navigating. It's rare we get to see old school Tzimisce in games at all, let alone with Tremere and Ventrue present.
And these after them:
Cappadocian (and Giovanni!)
Nosferatu (as above, but also brilliant for pulling out the humanity and tragedy in vampirism)
Lasombra (We prefer concepts going heavy on the religious themes and confessions/corrupted Catholicism, not a big fan of the "Hit Things With Tentacles" concept.)
Brujah (Especially want some older scholarly types with Carthage angst.)
In lowest numbers:
Malkavian
Gangrel (still would like some because of the glorious Omen War conflict drama to be had with the Tremere)
Ravnos
Children of Haqim
Followers of Set
Of course, a couple strong concepts in the last category will still always be welcome! We just don't want these clans to outnumber any of the clans listed before them. If you want to enter with a strong clan force, aim for one of the clans in the top category; we have a lot of strong roleplayers choosing from those, most of which are happy and eager to mentor. But we would really like to encourage old VTM veterans towards those top listed clans if you really want our opinion lol We love seeing the High Clans done well, with all their bigotry and elitism and self-interest. As organisers we don't really enjoy the vampires who break from the mould as much. We will permit such concepts occasionally, but we really love the game world stereotypes to be enforced and find that if you let in too many snowflakes who seem nothing like their clan... well, you lose the feel for that clan in general.
We love Toreador being dark with their obsessions; Ventrue expecting (and enforcing) the world to bow to their established ideals of elder and High Clan power; Tzimisce caring about hospitality, the old Gods, the old ways and being spitting furious at the Tremere; we want to see Clan Tremere at its power defensive locking leg against multiple external forces but literally a minute later when behind closed doors internally humiliating their apprentices and enforcing the pyramid structure while exercising all the bitchcraft of their group. We love clan stereotypes!