On the advice of Paul Gort I got an account with the Montreal hardware dealer Richelieu and ordered all my hinges through them. I bought Blum hinges with the optional 'Blumotion' clips, which adds a soft-close feature. It was worth the trouble of setting up an account and ordering online because the hinges were about half the price than I could find locally (about a third of Lee Valley!!). Drawer slides caused some grief though. I wanted the same soft-close feature but Blum Tandem slides with the optional Blumotion clips were $35 a pair. Including my pantry I have 30 drawers. That's $1050 in slides alone, more than the entire materials bill!
After some hunting around I found some ball bearing slides with a soft close feature at Lee Valley. At $13 a pair they seemed like a more economical choice.
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I was at PJ White last week and saw that they had Hettich soft close slides on sale. I played around with the little mock up drawer they had on display and they worked beautifully, opening easily and closing perfectly every time.
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Like the Blum slides, Hettich has a unique way of attaching the slide to the actual drawer. The slides themselves don't come apart, instead a hole in the back of the drawer engages a small pin in the back of the slide and the front clips to the bottom of the drawer with a set of plastic clips. The entire slides are hidden under the drawer which means the weight of the drawer rests entirely on the slide, rather than on a couple screws like side mount slides.
At $26 a pair they were twice the price of the shitty Lee Valley slides but $10 cheaper than the Blum slides. I think I'll still build a drawer mockup, just to make sure I don't mess up the actual drawers.