Strangely Rob was asking a similar question - what I do (and you are welcome to borrow) is have a selection of old BBs of varying spindle lengths. I try each in turn until I find the one that fits then buy the new equivalent
I enquired on the Dyna Tech string and Old Ned suggested 122.5, so being impatient I bought one from Evans. Don't have a chainring yet so don't know if it was a sensible purchase.
i'll stick my name down but can't promise anything as i'm waiting on a new bottom bracket for the FSR still, and waiting to hear how much the postage for the clockwork is gonna be, so curently i have nothing to ride lol.