Well, Marvin makes a true, wood/clad replacement casement window that can be made to size. If you can afford Andersen, it shouldn’t be that much more.
The Marvin unit can fit within your existing window framework and will save on labor costs. I have sold quite a few of these units. Talk with a Marvin dealer in your area. The unit might be higher, but the installation should save some $$$. Plus, if you purchase before the end of the year, you can qualify for a 30% tax credit (make sure they use the Low E 366 glazing).