I went with an Exped Comfort 600 from Bivouac. -6 rating and full sized comfort while still packing down nice and small. Good bags are really expensive but I think I paid somewhere between 300-400 for it on sale.
My advice is to wait for a sale in NZ and buy local. Otherwise you will probably get hammered on duty and taxes if you buy a good one from overseas. Plus you can't hop in them and try them. Even after trying one I walked out with it (Exped Ultralite) - but I went back the next day and changed it for the Comfort after having another couple of goes in it at home. Was just too small for me to be comfortable.
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