I am not sure if this is any help, but my husband and I were in a similar situation about 2 years ago when we renovated our bungalow. We had a lot of original windows and also needed some new windows for added on areas on the 2nd floor and back of the house. We ended up working with Schaaf Windows in the south suburbs to get all new windows that were custom made to match the original windows. We got wood interior with aluminum exterior. We had someone stain the interior wood to match the original woodwork/window frames. For us this was a more cost effective way to handle our windows - I think we paid between $150-$375/window depending on size. it also made it easier for us to have screens that were in good shape because all of ours were pretty shot when we bought the house. Not the same as original, restored windows, I know, but we really do love how they turned out.
~Megan