CAP, you should look at places closer than Tai Wai first.
Check out Manathan Hill in Mei Foo (very new, great views and next to the MTR/taxi/Buses and 10 mn minibus/taxi up some fantastic country parks)
Check out Bayan Tree, Pacifica...in Lai Chi Kok
Check out Olympic area
Check out the hunghom area (Laguna Verde, Royal Peninsula...)
only if you can't find in those very convenient places then look further such as Tai Wai.
Re buses/MTR debate.
There is a lot of fight between Movingin07 and DeletedUser on those boards between buses/MTR.
I have used both, both are very reliable by European standards, clean, efficient.
Buses are overall more comfortable (you can seat and not be pushed around) but less frequent obviously and more prompt to delay (obvioulsy also).
MTR at rush hour (especially on the way (Tai Wai -> TST) will be very packed (somethingDeletedUser does not experience since he leaves one MTR station away from his office and is in the office very early) but are on the dot, clean and a pleasure to ride by London/paris/NYC standards.
All in all check this website to get an idea on prices/size for the areas I mentionned above:
Centadata.com - Search Result
That will give you an idea of how much $ it will cost you