anna - Emily has grown very quickly as well. I skipped the newborn size altogether, and she was only in smalls for about 8 weeks at the most. She is now starting to fit into larges. MCN do resell very well, considering you have good brands. Which is why I stuck with itti bittis and baby beehinds. Bum G's are very popular as well.
When Emily was outgrowing her smalls, I sold them all, and bought mediums. I was lucky enough to be able to sell them to people on here.
With night nappies, I've only used bbh bamboo fitted with a fleece cover. I use both boosters in it, and it works for me.
I have a heap of Maz's fleece boosters which I use as well for either magicalls or bbh. When Emily is going down for her big sleep during the day, I'll generally put her in a magical with a booster.
All the nappies I have dry really well. But like you said, we're fortunate enough to get lots of sun, so drying time is only really an issue during the wet season (which is when your drier will come in handy).
Most of my stash are bamboo fitted, which are a one size fits all. These are really handy as it doesn't matter what the size, they'll usually fit.