Thinking of doing an OD build...There are so many!

[selfdestroyer]

Like others have said, make many and pick a few.

I have these I just finished and need boxing and I love em.

Sweet Honey - Really nice low gain OD.
Catch 22 - Can get crunchy but does sound smooth at low gain settings.
Modded Blues Breaker is also a nice choice also.

Cody

[Alaboogie]

Any blues breaker mods are awesome! I currently have a bb modded to morning glory specs ala Aion electronics and a queen of bone from rullywowr on my board and I don't see myself taking those two off for a very long time! Great bluesy overdrives.

As far as klones...dat buffer though!!