I've commuted from the Mid-levels to my workplace in Kwun Tong for 3 months, and it was not convenient. It would take me about an hour to get there, including the walk to the bus stop and clamoring with the suit-and-tie crowds to get on the bus. So, I moved to Kowloon side, closer to work, but was really bored when I was done with work, with nothing but brightly lit malls and dead industrial buildings greeting me on my way home.
I think that Sai Kung would be a great option if you're looking for a peaceful and quiet lively place to live at, and commute daily to East Kowloon. Alternately, North point is fantastic as there's a ferry going directly to Kwun Tong from there, and it's close enough to all the fun stuff on Hong Kong side, too.
But yes, I do think yo should come here first and see a place for yourself. It can take ages to find a place that suits your tastes!