Window selection is always a challenge. I just retrofitted all the windows (19) in my home in VA and the first month's gas consumption (Jan) went down by more than 50% compared to last year same time. Wonder now why I didn/t replace the windows years ago. My research found several options. price variation for similar units can vary as much as 100%. Choose carefully using some of the following criteria after you rank them in importance to you.
Your location in ME call for double pane gas filled with low e treatment to get maximum insulating properties.
Vinyl now has comptetiton from composites (made by Anderson)
Aluminum clad acts as a thermal conductor even with a thermal break and that paint will chalk over time.
Vinyl with titanium in the extrusion eliminates the warping and distorting of vinyl alone.
Any vinyl should be reinforced at the corner welds.
If you select wood or composites you are volunteering for painting over time.
Casements are more weather tight than double sash.
Warranties can vary a lot.
Good luck
