Don't forget jackson's
Sounds like Clapham Junction/Wandsworth common may be best for you. Plenty of big houses round there and low council tax.
As you know, I live in Motspur Park/New Malden area, i'd recommend either here or Raynes Park if you are a bit older (in your 30s) or closer to Clapham Junction if you are in your 20s and still want to go to clubs etc.