J.
I have cloth diapers of all styles. I love prefolds and covers best for little babies (under 1 year). I have really started investing in wool longies for my baby due this winter. My older child was a summer baby so we used lots of Bummies covers. I have lots of pockets. Daycare liked BumGenius pockets (one size) best, so I used those when my child was at daycare, but we never really felt the love for them at home. I have a few WAHM fitteds and AIO diapers that are nice, but I really didn't use them much until my child was at the toddler stage and we had instances where time was very limited for some diaper changes.
I found that the best prices for used diapers are either on the LiveJournal cloth diapering community or from www.diaperswappers.com I used to get good deals on ebay before they banned used cloth diapers. Try one of each style and try one of anything that gets your attention until you know you want to make an investment.
I know that I love Sumbuns (too bad she is no longer doing new diapers) for AIO diapers when I use them. I found that BumGenius was the best daycare diaper for me. The new "big deal" for fitteds is Goodmama one size fitteds, but I can't wrap my head around paying that much for a diaper. FuzziBunz are ok if you can get a good deal for used ones (pockets).