For newbies i always recomend Bumgenius..

these are one size fits all and AIO.. around $28 each. (kimbaz sells them at her store beyond belly)

Peapods have mixed reviews, i have personally not tried them but some love them some hate them.

Another Great brand is Itti bittis dlish, very popular and spunk too

And of course Cushies Tushies are great IMO the snap coutures are OSFM and some great patterns avaliable