As others have mentioned..stocking foot requires an extra purchase of boots. The first set of stockingfoots you buy will be relatively more expensive than a pait of bootfoot.
However with stockingfoots the boots should be a one time purchase, you will mostly not need to replace them for years.
The stocking foot are far more comforatable and offer a wider range of choices than bootfoot as well.
Either way make sure you get felt bottoms.
Here is what I use...It is a combination between paying money for quality,(boots which will last), and being frugal,(waders which are economical and can be easily replaced).
BOOTS....Chota "STL" Plus Wading Shoe
Possibly the best wading boot on the market, felt soles, plus case hardened steel cleats,(removable and replaceable). Feels like wearing a sneaker, grips river rocks like a boot..
http://www.chotaoutdoorgear.com/cybermerchant/scripts/prodView.asp?idproduct=52
Waders...Hodgman Wadelite® I Breathable Waders
Great compromise between quality and value..
http://www.basspro.com/servlet/cata...rch&cm_pla=I-search (Froogle)&cm_ite=DDI link