Hello and welcome to the tree!
Congratulations on your pregnancy.
There are a few things that you might want to consider. Firstly, while one size (OS) nappies seem a good investment (and can be!) they're often not very good at the extremes - newborns or much older babies. They can be bulky at first and not big enough at the end. Sized nappies don't have that problem, as they're designed for a narrower range. Our BumGenius nappies became fairly useless once Iris had learned how to undo aplix (at about 7 months).
Personally, I like to have a mix of different brands of nappy (most of ours are WAHM (work at home mum) made nappies). I haven't found one nappy that's perfect for every situation. It depends how long your baby is going to be wearing it (you'll want something more absorbent overnight than during the day), how old they are, how heavily they wet, who's doing the nappy changes, whether your baby can undo aplix or not! And there's also your washing/drying facilities to think about. That said, family members tend to get the same nappies given to them when Iris is with them. Then they know what they're dealing with. DH has his favourites, but has learned to tell the difference between fitteds and pockets now and what requires a wrap and what doesn't.
We use fitteds and wool at night. It's a much more breathable combination than a pocket/AIO which has the PUL layer. And when Iris was tiny, I would never have got the amount of stuffing we'd have needed to last overnight into a pocket. There would have been dreadful leg gape and leaks. We also can't use AIOs - not absorbent enough for my heavy wetter. Can't help on the wrap front, I'm afraid, as I've never used ME. But I'd shy away from aplix. I use wool soakers with fitteds, rather then PUL wraps.
I'd recommend trying a mixture of different nappies and not deciding on one brand. Different things suit different babies. Half the fun of cloth is trying out all the different ones.
I'm not sure if that's helpful or not.
I hope I've not just confused you more.