Yeah there's a lot of imprezas; people will tell you to avoid them cos they've been ragged (but people probably say the same about 1*2s!). A friend got a decent one for $1600 (£800).
I was living in Wanaka for the winter working/snowboarding/drinking more than my share - its an hour north of Queenstown, a slightly more chilled version. Both definitely worth a visit. I only stopped in nelson a few nights and got a good vibe from the place, friends spent the whole summer and loved it.
In a year i reckon you'd get to see a lot of the country, even if you're settled rather than travelling. As far as the roads go, first off it's hard enough to keep your eyes on it since the scenery is often stunning. Theres an abundance of great roads to drive too, loads of twisties here and there, one favourite was near you, from Motueka to Takaka on the way to Golden Bay in the abel tasman; the switchbacks on the hillclimb and the way down were great even in a s**tty auto mazda campervan. Entire West coast of the south island too, and south from Kaikora. Avoid the massive straight boring as f*ck route south from Christchurch :sleepy:
Enough about roads, NZ has enough natural beauty,, extreme sports, good surf, nightlife, good beaches, good coffee, clean air, amazing night skies (and on and on...) to keep anyone (except maybe the most urban city dweller) happy for a year. They're a little behind the times, it's kinda pricey, especially food and clothes but you soon get used to it.
Are you on a working/holiday visa?