I have a preference for Adobe products in general, they work quite well together....
I'll have to say though, Apple's iMovie is pretty impressive for an app that comes with the computer. On XP, windows movie maker is fairly capable for a free download too....but you have to XP, unfortnatly to use it.

To address the specific question, I really like premier. Its got a clean interface, it works well with photoshop and is pretty easy to pick up.