I use the bumGenius 3.0 one size diapers, and have for the last two years. One size diapers are great because they grow with your B., you can easily change the size, and they last from 7 to 35 pounds. They are pocket diapers, which are great because you decide how big of an insert to put in, depending on how much they pee, nighttime, etc.
I have 24, although 18 would have done it for me. When my son was younger, I would wash them every 3 days, now it is every 4 days. Pocket diapers suck the wetness into the insert, so the diaper doesn't really feel wet to the child, you shouldn't need to change them 10-12 times a day, we often do every 2 hours, but 3 hours is ok too (sometimes we forget and go longer). I also bought cloth wipes and reusable diaper liners, you just throw everything in your lined pail, and then wash all of it. They do save money, and you aren't putting all of the nasty chemicals on them. We just use water on the wipes, but I know other people make their own wipe spray, or buy it. We don't have any diaper rash issues, never have.
Here is a link to good diaper detergents: http://pinstripesandpolkadots.com/hedetergentchoices.htm. There should be a link to non HE detergents there also. I use Planet detergent, and bleach every few weeks (to get any extra funk out). BG suggests bleaching once a month, but I would often not do that, and it caused some issues, so I now I do it more often. Cloth diapering does take a little experimenting to see what works for you, but it is worth it.