Basically the commonly used Nikkor lenses are 10.5mm, Sigma 15mm, 12-24mm, 60mm macro, 105mm macro. Some other alternatives are 70-180mm macro, Sigma 150mm macro.
For wide angle, new Sigma 10-20mm and Sigma/Tokina 12-24mm are also an option.
For wide angle, I really like the 10.5mm but Sigma 15mm might be an easier lens to start of with. 12-24mm is very nice but expensive. Sigma got some really good feed back for 10-20mm but I don't know which housing manufacturers support that lens yet. 60mm is good for macro and fish portrait type work and 105mm for general macro.
I am not a big fan of the 18-70mm as it requires diopter and does not focus close enough for real macro work and not quite wide enough for real wide angle work but is probably ok if you want to do fish portrait only.
First I would check with your housing manufacturer first to see what lenses they support as not all of them will support the same range of lenses.