It depends on a few things:
1. what are you using them for? Light period? Bladder dribbles? Everyday freshness?
2. How many absorbent layers do you plan to use?
3. How often do you plan to change?
If you think that you will leak...
www.bum-ware.com has THE easiest diapers to use. Her "extreme" AIO's are JUST like a disposable. They have stay-dry suedecloth inside and are extremely trim. They are the only AIO DD lets me put on her without saying...
There are some less inexpensive option for fitted type diapers.
Such are www.babybunz.com for the snugglebottoms or prefitteds (prefolds converted to a semi fitted diaper w/ elastic that is less bulky and easier to use than a prefold...
Well, NBs go through SOOOOO many diapers that prefolds are the cheapest route. Plus they usually outgrow things quickly as well, so again, prefolds are cheap and can be used for other things after baby outgrows them.
Flushable liners! They don't keep EVERYTHING off the diapers, but most of it. I loved my sprayer before we moved, but it doesn't connect here at our place we are renting.