If you are making major changes or additions to a template, ask how they will accommodate modem viewers and those without Flash. This is a young technology. Be prepared for youth. Have your prospective designer look at the template carefully. They should be able to see what is involved by looking at the finished product.
Some templates are more difficult than others to adapt.
Make sure you get the adapted active files if this is important to you so that you can make changes later without a particular designer. Feel secure with the designer you have chosen as active template files cannot be returned for exchange or refund. The Designers In absolutely NO order whatsoever.