It's been awhile since I've seen it, but I watched DBZ pretty much up to mid-way through the Buu saga, though I still think it should of ended with Cell. The Buu saga had its good parts, but for the most part, was kind of lame. I'd say I liked the Nameck/ Frieza sage the most. Sure, it took forever for Frieza to "die" and five minutes to pass, but it was an awesome better. I didn't really see the original series until after most of the DBZ episodes though. I've seen much of that series as well and I know understand the roots of Yumcha's obsession with Bulma.