In reply to MikeR: Have a great trip - what are you planning to do?
We shifted out with AP and they were pretty good (although we didn't have to pay...). Arrived reasonably quickly, which was a shame as we didn't have anywhere to put it until we bought the house! Stayed in storage but all worked out well.
We have sent back stuff with GeoLogistics in 2002 and they were great - cheap, fast, efficient shipping (only took 10 days), and again in 2006 when they were slightly slower and slightly more expensive.
Taking family and 128kg of luggage via LA is cheap but a pain in the backside - it doesn't fit on one trolley, which makes herding toddlers through security a challenge!
As Helen says, exchange rate much better for kiwi dollars in the UK than spending pounds here - a good pair of mountain boots costs about NZD800 (about 26 CDs or paperback books out here, or a season ticket for the main skifields) which is about 350 quid at the moment (which would but a lot of CDs or books in the UK).
Good luck!
B