As some people have pointed out the MTR gets incredibly crowded at rush hour, the same applies to all other forms of transport.
As you have a bank job, what time will you be starting work and finishing? What you may find is that ironically the closer you live to the office, the harder it is to commute as you can't physically fit on the Bus/MTR nor find a taxi for love or money. I have some friends how live on the far end of my street (1km) who have no problems catching the bus, whereas my best hope is a sweat inducing walk at the same time.
Mid-Levels is doable, but not easy to find, at your price if you are willing to live in an older building without the facilities.