Jason,
If I were building a custom Mauser... (And yes, I've built more than a couple...) I'd go for the commercial actions:
FN
JC Higgins M-50 or M-51 (FN action)
H&R (FN action)
Firearms Int'l (FN action)
Husqvarna
Lastly; Interarms MK-X, Chas Daly, Remington 98
I'd steer clear of the Santa Barbara (Made in Spain)
Military actions I'd consider: VZ-24, 1909 Argentine, FN or Oberndorf Mauser
Just a matter of opinion... Hope it helps...
Someone else's opinion may differ...
Edw