I picked up X-Factor volume 1, and I like it! There are DEFINITELY series I am not willing to splurge on omnibi prices, but that I would happily buy at Essentials rates. ALSO, one of the local stores are selling theres all off for about $10 each! What are the key volumes? I really want Uncanny X-Men vol 2 for the Dark Phoenix, and the other Claremont stuff, and I wouldnt mind checking out the Byrne FF as well.