Cot4cloth do lovely (if expensive) clothes with extra large bums. But I've also just bought a few Bamboozles and an Ella's House hemp nappy and the difference in bulkiness is really noticeable.
Tatties - anything Totsbots do are great. Really, really recommend the new Bamboozles nappy. Their wraps are adequate, but there are better out there ie Motherease - ideally the poppers ones. Fleece wraps are good for the summer or for night-time.
I like Nature Babies wraps too, but mainly cos the prints are cute. I would say they were only suitable in the daytime when you'll be changing every 3/4 hours.
Get a laundry net to sit inside your bucket so you can lift the whole thing into the machine without laying a finger on anything evil
Mothercare do nice nappy buckets if yours has to sit out "on display" in the bathroom IYSWIM.
About 20 should be more than enough for a 9 mth old unless you get carried away buying cute stuff rather than just useful stuff!
Consider washable wipes too. Nappies by Minki and Ella's House do great fleece ones and other types - quite funky and far better than a pathetic ickle throwaway one - especially on evil poo
Um...and feel very smug about the hundreds of quid you'll be saving.