It depends on your budget and your plans of how to dry them. Some fabrics (liek bamboo and hemp) can take days to dry but if you have - and dont mind using - a tumbledryer, then its not as much of a problem. Making sure you've got plenty of nappies usually helps this too.
If you dont have a tumbledryer (or dont want to use use it much, and lets face it they cost a fortune to run!) then you may be better suited to pocket nappies or cotton fitteds, as these tend to dry much more quickly. I've never had a tumbledryer and never found it a problem, but again, having plenty of nappies (at least 25, more if you can!) will help.
Popular pockets are Fuzzi bunz, weenotions pockets, wonderoos, upsy daisy nappies and there are plenty more. Those ones just tend to be very reliable and dont break the bank either (unless you get carried away with embroidery option on the WAHM sites!) and i like blueberry onesize inserts for most pocket nappies. Im not a fan of AIOs - tbh, there are very few that are reliable, and they're usually not that pretty either (if thats important to you at all). They can also take ages to dry and i think most people are better off with a reliable pocket nappy - they dont take long to stuff and they dry much more quickly.
For fitteds, my favourites are puddlekins, flutterby fluff, weenotions, upsy daisy, motherease onesize bamboo etc. Fitted nappies with a wrap or wool cover are more reliable than pockets, as they have 2 layers to protect against wee and poo leaks, and really arent as much hassle as you might think.
Some people are scared off by the "high cost" of WAHM made nappies but i find they are often superior to similar nappies made by commercial manufactuers, and the basic options arent usually much more expensive either.
There really is just so much choice! Have a look through the classifieds and you may find a few good bargains on there