Bumgenius 3.0 are the bomb. I really like the pocket ones with inserts, rather than the all-in-ones, but I guess it's a matter of preference. It's also nice to have a few fitteds with covers, too. That way, I can put a fitted on my daughter to let her "air out," since they breathe so well. After half an hour or so of her staying dry, I'll add the cover since I know she'll pee soon. But meanwhile, her skin has gotten a break from the whole diaper routine.
I have about 12 Bumgenius, 10 fitteds, and 6-8 covers (you can use the same cover for several fitteds, as long as there's no poop on it). I really like THirsties covers the best. You just have to make sure to cinch them nice and snug, or the top will rub that little tummy and irritate it.
Most people have a lot more diapers than that - maybe 25 Bumgenius and a couple of fitteds and covers, for example.
Bumgenius is great becuase baby never feels wet. It goes right through to the inserts. Wonderful for overnight and long days out on errands/whatver. But you still want to get that diaper off and changed for hygiene.
Savings: You might spend, oh, $300 on cloth diapers for your baby's entire diapering needs, till she potty trains, while disposables will cost you about $2,500 till she potty trains. Not only that, but if you get cloth wipes and water (keep the water warm in a thermos, refresh about once every day or two), that saves you God knows how much more. Cloth wipes will run you about $30. Sposie wipes? Oh, I don't know, since we rarely use them, but I imagine they cost you about $500-$800 from birth to potty. Just calculate how many you used on your first baby per week, multiply that cost by 52, then multiply *that* number by 3, if 3 is when you potty trained.
For errands/being out and about, we still use cloth/wipes and use a wet bag, which you can find at any cloth dipe site. I like cottonbabies.com.
As for laundry, I recommend Country Save. The best deal I've found is for $60 at amazon.com for some unbelievable number of loads. Will probably last you till your daughter potty trains! Esp. because you only need like a tablespoon per load.