Have you tried using RSD lite and the stock SBF file?
http://forum.droidmod.org/index.php/topic,314.0.html
I've done this twice, and they say its pretty risky..but just be careful. (like ripping out the cord and what not) This is used by Verizon to "recover bricked phones" but it essentially returns you back to the "brand new state".
Hope this helps!