After 2 years of searching, I finally found one of my favorite books.  For the life of me, I could never remember the name of the books, only that they were a twist on Choose Your Own Adventures.

So what are they?  They are a series of books that came out in the mid 80s.  Unlike most CYOA, you actually choose to be a wizard or the warrior, and your story changed depending on that choice. You also chose spells (if you were the wizard) or weapons (if you were the warrior).  These choices also impacted how the story unfolded.  They were very much more of a true role-playing game than a CYOA.

So now?  Now I must collect them all

Those were fun!  "Haunted Castle of Ravencurse" was my first non-"Choose Your Own Adventure" (the actual Bantam CYOA books) multiple choice book.  I bought it at a school book fair.  At the time it was one of the creepiest books I had read.  

They were sort of a half-step between the basic CYOA format and the true Gamebooks (the ones where you rolled your character and ran RPG-style combats).  I found them a bit too random at times though, where if you didn't select the right weapon or spell you were toast, even if the selection had nothing to do with the challenge.  And as Demian puts it on his gamebook site, it was "possible to die as a result of guessing the wrong random number, flipping a coin poorly or reading the book on the wrong day of the week".

Still, they were a hoot.  I think I only had the first five or so.