@StaceyinLA I'd be glad to answer any of your questions through my experience with my sisters (6 kiddos who have gone through/ are in CD) and my own daughter I have done lots of research on the matter! I also have written various reviews on my blog too if those might help.
Easily for expenses/value and effort I say my first choice are Prefolds and Covers. More specifically I say Diaper Rite Prefolds (from Diaper Junction) are the best size, quality and material. Next I like Bummis PFs because they are Organic. After that I would say Green Mountain Diapers (GMD). With covers I had the best experience with Bummis Super Whisper Wraps, Super Snaps and Super Brites, until my daughter was able to undo the velcro. Since then I have gone to Bummis Super Snaps, Kissaluvs Marvels covers and I'm going to try out a Flip cover this week (waiting on the mail). For nighttime, no contest Disana Wool. The best price I have found is from an online store based in Athens, GA - A Small Green Footprint.
After prefolds I love two other types of diapers if the funds are available. FuzziBunz One Size Pockets (and their new hemp!) and bumGenius AIO Elemental Organic One Size Diapers (AIO - All in One).
I could go on, but I'd love to answer any specific questions you might have and not bore you with the rest. I do have specific stores I'd suggest too.