I would recommend the same thing (engineered wood i-joists). You could span the entire garage with these. You could reduce the depth of the joists (thereby reducing the cost of material) by installing a beam at the midpoint. But then you have the added cost of the beam and labor to install a beam, whether it be wood or steel. Check with your lumberyard and see what the difference in material cost is. Also, verify whether a beam would be feasable, based on your design.

You might also want to keep in mind that a large beam may keep you from installing automatic door openers.