I have a full-sized HP PC case and want to upgrade to a new mobo with an AMD socket 939; AGP and PCIe; etc.  It came with an ASUS micro-ATX mobo with an add-on board to handle two additional slots.  
 
I saw the article in THG about the "ASRock 939Dual-SATA2" which sounds great!
 
The one catch is, I am not an engineer.  So, I want to upgrade mobo's without doing a mod on my case.
 
I would appreciate some advice.
 
Thanks!

any ATX / micro ATX board will fit , you may have to remove one of the extra stand-offs at the rear
 I done this to my brothers PC , sounds the same deal , his had ASUS A7V-Vm board , put in A7N8X-E
 you should have no problems