I second Captain Britain and MI13

also

Uncanny X-Force
Post Heoic Age Avengers
Avengers Initiative and Academy
Moon Knight (starting with Huston run)
Ms Marvel ( the one that started after House of M)
Geoff Johns Avengers

an omnibus or a series of hardcovers would suit fine for any of these, mainly so I dont have to get them as Premier HCs . I dont mind Premier Classics as many of them are thicker but the PHCs are just too thin for me. Also, so many of the Classics trades would be so much better suited as OHCs as I believe the material within caters more for the type of reader who would be prepared to spend the extra money for them in a premier format. TPB should be reserved for the thinner collections of newer stuff, ultimate collections and the essentials (ie for people who want to read the stories but dont necessarily have a collector's interest).