Actually, I far preferred Christchurch, given that it felt like I was related to half of sodding Nelson, and everyone was into everyone else's business!
It has a great arts scene, and also fantastic hospitality, and some good wineries. Very good facilities, swimming pools, sports clubs, cafes and restaurants. If you want to view a bit of property porn, Trademe.co.nz is good.
Richmond, about 20 minutes out of central Nelson, is undergoing huge growth at the moment, with a lot of property development. I used to live there, and it is nice.
Shopping, you will find in NZ to be a bit meh, compared to what you are used to over here, with a far more limited range and variety, and it is expensive.
Richmond also has good amenities. Some would argue better than Nelson central, especially now, and it's a lot more walkable.
Education, in Richmond, you'd be looking at Waimea College for secondary, although there's Galvin/Garin college there now, as well. There's a few choices for primary.
In Nelson, for secondary there are two integrated colleges, Nelson College for Boys, and Nelson College for girls.