she is a bit old for her first litter but anyway
to start with bo fraizer(spiral dog if i have the right one) is the outcross and overall looks good and fortified has had success when bitches are crossed back to the aussie lines via the dam side
nitro burst a shiraz dog has had some succes into this line but limited really for two reasons not done alot and just didnt work would be wary of crossing these two
velocette like nitro to me has its problem also i think putting this fella to her would give you sprinters and little else
as i guy who has and does use unproven sires all the time(and proved right alot ) i was the first to use larkhill jo toms the best and a few other but this fella for me just no his sire has been average
best of luck

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