Wow Jodi thats a massive order. Have you tried the BBH nappies at all?
I found they were a terrible fit on Isla.
I would have been more tempted in getting a few to try before such a big order.
My suggestion would be to only wash & try a few before prewashing ALL of them. That way if you don't like them you can onsell them as new.

Good luck I hope they are a good fit for you.

eta - oh der just re read your post, this will be for Bubba wont it. Well you should be ok.