Beam Sizing for Wall Span

I need assistance in determining the size of a beam for a 6.5-foot open wall span. The beam will support one floor above and is located in an inside wall. The floor joists above run in the same direction as the wall... (Budget: $750 - $1500 USD, Jobs: AutoCAD, Building Architecture, Building Design, Civil Engineering, Construction Engineering, Construction Management, Engineering Drawing, Structural Engineering)