W32Dasm ...
I can't explain why specifically, but this was the most useful cracking tool I've user, I cracked so many programs in those years. I loved also SoftIce, but WinIce gave problems with the graphic card from time to time, and for my taste, it did not adapted too well to Windows systems (maybe using it in a dual monitor could work today ...
)
But W32Dasm was a pleasure to use, and worked very well.
Other tool in this league could be Ollydebug, soooo many hours using it.