Considering your two choices, it doesn't matter what length or type spindle your current BB has.
If you get Omniums, they don't use a traditional spindle and include a GXP BB specific to that crank. If you choose Sugino 75s you will need to use a BB having a 109mm ISO spindle, which I am 100% certain your stock BB does not have.
Last edited by Scrodzilla; 06-03-14 at 11:52 AM.