In reply to andrew roach:
The kind of objective you're after isn't one that NZ is particularly good for. The Remarks GT really stands out for rock quality and accessibility, not to mention the position and views. The traverse of the Homer Saddle (out and back) is another possibility if you're down that way - it's an extremely exposed bit of terrain, as will be painfully obvious if you go there, so take a rope.
The usual (anticlockwise) approach to the GT means that most parties descend off Single Cone down the south gully which, as you say, is equipped for abseiling. From the top anchor to the bottom one is, annoyingly, about 33m. There's an intermediate anchor on the right (facing in) side of the gully about 20m down but I really can't remember how easy it is to reach where there's no snow in the gully.
It is possible to scramble down the gully but you're quite exposed - there are cliffs below the easier terrain under the gully - so I'd suggest lowering or belaying the first person(s) down to the bottom anchor and having them place the odd bit of gear then they'd belay the last person down to them. (Care needed with loose rock if you do that.)
For gear hire I'd try emailing MT Outdoors in Wanaka.
It's quite possible that it'll snow on the Remarks in March but it shouldn't hang around too long once the sun comes out.