Wow Oberon, that was some post! I haven't checked the Wikipedia entry for Low E in a while but I reckon a lot of your information would go well there.
I have the typical home window glass as you mentioned but not sure which of the two versions I have. I went with American Craftsman 9500 windows at Home Depot and they say, "U Factor: LoEČ Glass - 0.35". I did not get Argon filled ones.
I'm not sure if they are the greatest windows in the world but they seem to work great. I did the Patio door a couple weeks ago and all eight windows last weekend (yes, quite proud of myself!). It's impossible to tell how effective they are but compared to the previous dilapidated aluminum single paned windows I sense already that the heater is firing up less than normal. The patio door, which work next too, is a huge difference. The interior glass is still cold to touch, but I'm sure not half as cold as before.
Thanks again for your post. I'll have to get it a couple more reads to let all the info sink in!