Hey TBOT wisdom. The time has come to replace all the windows in my mid(20th)century house with something a little more modern. My PUD has a pretty healthy rebate going on right now, so there's incentive to do this right, while realizing that the Taj Mahal this ain't. The bedroom, bath, and kitchen windows are plain old single-hung and I can't think I'd do anything else except possibly make a bathroom window that doesn't open. There's going to be the mother of all exhaust fans in there, and since the window is in the shower surround, I don't ever open it while I'm showering. I never open it, period, because once I get out of the shower I pull the shower curtain closed again... so I can't see that window, and would likely manage to leave with it standing wide open. My neighborhood's not THAT great. The living room and dining room each have a large (6' x 5') window. The current ones don't open. I'd like to have something that opens, but the 'three piece' doesn't look right on houses of this style. Both these windows face west, and there's plenty of sun that comes in until it gets low enough to get swallowed by the trees across the street. By that hour, there's a nice west breeze that I'd like to invite in. The living room also has a large (4' x 5') south facing window. I tend to forget it's there because I keep the curtain pulled since the view is to my neighbor's patio, six feet away. So what do I need to know about this? We're talking vinyl, not wood or fiberglass, and triple pane seems silly. Brands available to me from the contractors I have to use are Milgard, Marvin, and PlyGem so far. Do I want super duper low-e or HP glass in the west windows? I'm not contemplating tint because it is so dark and grey here most of the year. Will I be sorry if I just get a frosted glass pane in the bathroom an not get something that opens? Please advise.