The best place to start is diaperpin.com. I found this site to be very helpful, as it has reviews on diapers and covers, as well as links on where to buy. It also has useful advice on how to wash your diapers, and gives an idea of the different types of diapers available.
Personally, I really like Kissaluvs diapers. They come in two types, the contour and fitted. Go for the fitted!! The contours were just messy, no elastic around the legs to hold anything in. The diapers are made of a thick terry, which is so soft, VERY absorbant, washes well and held up through BOTH my children!! The fitted are great because they snap on, so you don't have to mess with pins or the snappi invention that I could never figure out.
A lot of moms mentioned Motherease. I highly recommend their covers!! Their diapers are also made of thick terry and have all the benefits of the kissaluvs. What I didn't like about them is the one size thing. Now, perhaps my babies are just very slender, but the Motherease diapers that I was given were always very bulky on my babies, until they were big enough that I didn't have to fold the front over. But then they required a snap-in liner.
I have no experience with the cushies diapers. When I looked at one at Babies R Us, I was unimpressed. I do think that having the cover attached to the diaper would have been nice. I just didn't think they would be very absorbant or stand up to all the washing. I always purchased 2 dozen diapers and did a load of diapers every other day.
There is a new type of diaper on the market, which may be worth checking out. They are called gdiapers. Go to gdiapers.com. They are a cloth diaper with a cover, and you buy the disposable refill pads to put in the diaper. The pads are free of plastic and you can flush them down your toilet. Sounds very clean and easy.
I hope I have helped you out!! Good Luck!!