If you intend to propel yourself in the wheelchair, you will need to a consider 'self propel' wheelchair found here. Self Propel wheelchairs are distinctive in that they feature large back wheels. Whilst these wheelchairs are primarily designed to be used by the occupant many models feature pushing handles so that someone can push you when required.
If you feel you may want to propel yourself even occasionally, we would recommend choosing a self propel chair. Self Propel wheelchairs generally offer the best of both worlds but are wider and so may be more troublesome when moving through narrow spaces especially door frames.