When taking a portrait, the most important thing in your picture is the main subject. The background should be cool but the subject should be the main focus. You need to separate your subject from the background by, for example, narrowing the depth of field to blur it, restrict the flash light with a grid spot so it only light the subject and leave the background to the ambiance light or throw the background to some motion blur and maintaining the subject acceptably sharp.
This technique does not require you to own a fast lens (with great aperture), you don't even need a moving background, but you need to own an external flash gun triggered off-camera. It will help you make the background less obvious by bluring it in a stylish way and also create some special mood to the picture.
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