History/Evolution of Callaway Irons

[Gresh24]

I was wondering what the evolution or progression of Callaway Irons were, more specifically in their (Super) Game Improvement line.  I have the 2004 Big Berthas and am considering an upgrade.  Are any newer models that would be a significant upgrade from my '04 BB's?

What came after the Big Berthas?  X-18 and X-20's?  Then to the Diablo's?  I guess I'm looking at what the time line for the clubs are.  I can't find it anywhere.

Thanks

[newtogolf]

Here's an overall timeline of Callaway Golf, including clubs (though not specifically SGI).

http://www.callawaygolf.com/global/en-au/corporate/our-history.html

[Gresh24]

Originally Posted by newtogolf

Here's an overall timeline of Callaway Golf, including clubs (though not specifically SGI).

http://www.callawaygolf.com/global/en-au/corporate/our-history.html

Thanks!  It looks like the BB's transitioned straight to the Diablo's.  I don't really like the '08 BB's and the Diablo's are a little more than I want to spend right now.