STL to High-Precision STEP Conversion

I have a batch of STL meshes coming straight from a 3D scanner. They are all mechanical parts and I need each one rebuilt as a watertight, feature-based solid model in STEP format so I can run accurate simulation and analysis downstream... (Budget: $30 - $250 CAD, Jobs: 3D CAD, 3D Design, 3D Modelling, CAD/CAM, Mechanical Engineering, Reverse Engineering, Solidworks)