"I've never even used any other brand of housing, so I've no idea whether my Sea & Sea ports would be compatible with the Nauticam, or if I should be looking forward to acquiring all new ports?"
One of the great things about Nauticam is it shares very similar geometry with Sea&Sea. By changing the "rings" on back of ports you can use most if not all on Nauticam. Nauticam also makes an adapter gear for using S&S gearing (and other brands). I switched over from S&S a few years ago for this reason.
Have stepped up to D7100 so am parting with D7000 and housing. Nauticam NA-D7000 is in very good condition, never any leaks or issues. Bought new from Reef Photo. Will come with orginal box, allen keys, extra o-rings, intructions etc. Also includes the optional stainless handle to body brackets ($60). No balls included.
D7000, body only, is in very good condition with approximatly 12,200 shutter count. Just back from Caymans, haven't looked at count. It will come with original packageing, battery and charger, strap etc and a D7000 Field Guide instruction book.
Would like to sell to someone in USA because of hassle involved with International shipping. Paypal can be arranged, prefer no Credit Cards unless you are willing to pay the 3% fee. Not sure on shipping costs but they would be the actual amount, probably UPS insured.