Reusable nappies - have you tried them? I think they're a great idea but we hated them and I seriously suggest don't buy the whole kit first, buy one or two (most of the makers sell trial kits) and see if you like them. We bought the whole kit - nappies, liners, covers and then gave up after a couple of days as every time DS wee'd it soaked through and he had to be changed immediately and his clothes were constantly wet so we gave up, it was just impossible for us as newborns wee so often. So it ended up being quite a lot of money wasted. I have one friend who swears by reusables and used them for 3 kids but a lot of people find it's too messy or that you have to cart too much stuff about or they have problems drying them so it's best to try them out to see if they suit you. I really recommend you don't splash out on the whole kit in one go as a lot of people give up and the initial spend is quite expensive.
I'm not convinced the price difference is as big as they make out as you can usually get the disposables on special offer and washing the reusables can really hike up your electric bill if you need to use the tumble dryer a lot which everyone I know has had to do to get them dry except on the hottest of days. Most people I know found they just weren't workable for them. Best of luck though!