The definition of premium ofcourse depends from user to user and is open for debate. I would consider premium as trackers which are not open for signups frequently and cannot be obtained very-very easily by just asking someone here (such as Revtt, TL, SITR etc). Also while listing your trackers you can/should mock the preceding posters for considering a really cheap tracker as premium.
I throw myself in the ring first. The premium trackers I own (listed by importance) are:
Note: I have posted this in the invites section because most people would not be comfortable listing their premium trackers in the general section and be flooded with newbie requests. Ofcourse some may not be too comfortable with it here either.