I would strongly suggest getting New Bloods, they have more chance of getting higher price cards
Every time i've gotten new bloods in the past i end up with new characters worth 500-1000 clintz it just doesn't seem worth it to me.
I would welcome anyone who could tell me what the most expensive clans are at the moment. I've googled a lot and all i can find are results from 2010 that are a bit outdated...
In terms of value, New Bloods and Extended packs are the best. For Extended packs, select what's listed on this website (information is up to date).
http://urdb.kirlad.net/packs.php
Frozn (Kalindra) Sentinel have good uncommons (copper/coby) Pussycats have some expensive cards
Clint City, night.