Dawn Princess sailing May 18 2014 - 104 days round trip ex Sydney
Check out Vacations to go Fast Deal 12296 for a guide. Expect cost to be discounted to around $15000
I missed out on a similar cruise departing 20 May 2013 because it was booked out and it took too long for prospective cruise partners to decide. In this instance booking six months in advance was not good enough. Lesson learned.
I live in Sydney ( well Woonona ) and can offer pre or post cruise hospitality.
I cruise many times a year and seek out bargain deals. Have shared with strangers many times with great success even three in a cabin, 2 men and one woman who I'm sure would provide references.
Another option to consider is the Sydney to New York sector of 66 days.