third parties yoin my scores...

[Chris Stark]

Your biggest problem by far is time to first byte. It's either the database being really slow or your hosting being slow. I see you're using the Magento CMS on what looks like Amazon Web Services. I'm not a huge fan of AWS but you've probably got less options if you're in NZ. Might be worth having a talk with someone at Rackspace http://www.rackspace.com/ecommerce-hosting/magento/ since you'll get a lot more help out of their managed cloud service than you do from AWS on the server/db setup side of things. As far as loading the .js at different times there are a number of ways to do that but I don't think that's really as big of an issue.

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Additionally on your third party tags you'll notice a significant amount of time is spent doing a DNS lookup. You can speed that up by doing DNS prefetching. You can google about it or I wrote a post about it a while back on my blog. DNS Prefetching