I’m in Ontario (Canada) where (like most places I guess) vinyl window makers are typical for this area. 

I’m going to be replacing my windows more or less one at a time, starting with a couple of patio doors I’m pulling out and replacing with large picture windows (65 x 48).  This house is 43 years old and has original pella windows.  They are double-pane but the inner pane is removable.  Main complaint is fogging and ice buildup on some of them during winter (even with moderate to low humidification).   The panes are probably 3 mm but maybe 2 mm?

For the picture windows, my ideal is dual-pane where the panes are each 6 mm, separated by 1 inch.  One of the panes (probably outer) would be two 3-mm panes with interior plastic lamination.  This is mainly for acoustic reasons (busy road behind me, ambulances and fire engines typically) but the resulting construction should be good as a thermal insulator.   I’m somewhat fuzzy on the coatings – these would be north-facing picture windows with zero concern about summer solar heat gain.  Keeping the heat in in winter is far more important.   Big thing for me is relatively large pane-spacing (compared to what I think is standard) and pane thickness.

As for frames, I don’t like vinyl, and these would presumably be heavy windows so I’m probably looking at either wood clad with either vinyl or fiberglass or completely fiberglass.  For the interior I’d like to have wood.

Are these specs reasonable?  Any idea from where or from who I could get something like this?