Best place for windows

[Joel Rightler]

Hey BP,

Just closed on my new duplex (live in one side, rent the other).

I'm in need of window replacements. I'm located in Southeastern Michigan. I've called and gotten a quote from Wallside and they came in at 12,000 for 16 windows and 2 doorwalls. 

This is a bit pricey for my tastes, so I'm wondering where you go to buy your windows? Home Depot and Lowes SEEM like they'd be better options, but I've heard (read) horror stories about their contracted installers, so I'm hesitant.

Where do you get your windows?