In terms of architectural styles, Virginia pretty much runs the gamut. If, for instance, you plan to build a home in Southern Virginia, you may want to consider a colonial, country or farmhouse home plan, as these designs tend to be popular in this area. On the other hand, if you plan to retire to Northern Virginia (which can be thought of as a "suburb of Washington D.C."), just about any architectural style is possible, depending on your exact neighborhood. Furthermore, if you plan to build near the water (such as in Virginia Beach), you might want a house plan that offers piling (or pier) foundation and a fun, beachy look and feel. Then again, if the western part of the state is calling you, a more rustic type design might be just what the doctor ordered.
** Please note that some locations may require specific engineering and/or local code adoptions. Be sure to check with your contractor or local building authority to see what is required for your area.