Just did a remodel, and had a bunch of new windows installed. First know the different types of frames available. Wood, wood clad, vinyl, fiberglass composite, etc. Know the different types of panes, gas filled double panes, low E, etc. Then know the warranties. Most warranties offered are pretty decent from the big name mfg companies.
I can tell you that we took out a bunch of old double paned, metal framed, no UV protection, no inert gas filled windows, and wow! What a difference in thermal regulation. Not to mention we probably won't have the UV light fading the wood floors issues that we had experienced with the old windows.
IMO, it's money well spent for a high quality window.
FWIW, our room was south to SW facing, so lots of sun exposure.

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