I LOOOOVE the diapers we use … Motherease. Nicholas has used them since birth (they’re adjustable, so great for growing kids) and is still using them at 32 inches and 28 lbs (almost 20 months).
You can often find them used on Craigslist or in the Motherease forum (we got a full set, used, from my sister-in-law but did purchase some supplementary ones off Craigslist). You can also buy them at Discount Diapers in Point Grey (also known as K.G. Kid’s) for the same price as online (avoid shipping cost and time). Motherease has a great introductory offer if you want to try them out first.
We have mostly used the One Size diapers, but if you find the Sandy’s diapers, they’re good, too. We’ve used both the Air Flow and Rikki’s Wrap covers and like them both. The Stay-Dry liners are great for those times you know she’ll be in them for a little longer, as it pulls the moisture away from your little one’s skin (it’s made of a wick-away material, like the shirts worn by runners), although it’s polyester, not cotton, so maybe better to try one before you commit to buying too many.