Hey Cindy!
We have some BumGenius, we're mostly using prefolds though. The BumGenius dipes are great and convenient.. the one size dipes are actually pocket diapers, but still very easy to use, just stuff the insert in and it's ready to go. They are our favorite overnight diaper right now because she can't feel the wetness as much as she can with a prefold. A lot of people also use Fuzzibunz (I think these are pockets too, correct me if I'm wrong?), which I've never personally used but have heard good things about. I like that those have snaps rather than velcro, the velcro on the BG diapers is already starting to curl so I'll probably be getting some Fuzzibunz before too long.
I'm also finding how much I like fitteds. I only bought one before she was born because I didn't know if we'd use them, but I really like them and plan to buy more in the next size up so she can wear them longer. We have Kissaluvs right now, which is great and fits her very well. I wouldn't use it as an overnight diaper though, they're not the most absorbant.
Not sure about websites to get them from, I buy most of mine from a store nearby... I spend a lot of time on diaperswappers.com lurking for good deals. If you don't mind buying gently used products, you can get some great prices from mamas on there and shipping is usually included in the prices.