Having been in N. Virginia many times, during all different times of year, I'd say most likely no, truple pane is not overly neccessary, and that price seems pretty high, AND rule #1 on windows. Aluminum in a window is not so good. Soft metal that easily conducts and retains cold. Wincester also makes the Bristol window. Prety much the same thing. that stupid lock they have, to open, you slide it to the middle. Hope you don't have mini blinds, because everyone I've seen how has torn the people's mini-blinds up, because it sticks out so much. The vinyl is made from reprocessed material, which isn't the best. The specially formulated glass mixture is argon/krypton mix, which doesn't mix; it seperates from one another.
It's a 7/8" glass pack. Better windows use a 1" glass pack, because maximum efficiency occurs in a 3/4" airspace, which is what you have when you subtract the 1/8" panes of glass, unless Oxford uses 1/16" glass.
the "warm-edge" spacer system looks like the Intercept spacer; A metallic spacer that still conducts cold from outside to inside.
There's a thread on spacers on this board right now you can use to research.
I'm not impressed with these.