You are in an enivable situation. Your budget & wants are good enough for pretty much anywhere in Hong Kong. Here are my thoughts.
Since you have no kids (no worries about being close to school) and wife is going to work from home. Your only criteria is convenient to work and some room to run.
Top Choice would still be Happy Valley; very convenient transport wise and close to the racetrack if you just want to run around. Close to everything else. Plenty of greenery with views of the mountains as well as racetrack.
Second Choice : Mid Levels; can walk to work (escalator) but bit of a concrete jungle with very little greenery. Can run/jog nearby (BowenRoad).
There are many many other choices, if you are willing to put up with the commute. eg : 40-50K will get you a full house (2100sqft+roof) in SaiKung, Lamma, Lantau as well as many villages in the New Territories. 40-50K will also get you very nice apartments with full facilities in many locations around town near MTR.