A "drop bracket" kit, is a bracket's that replace's your stock suspention mounting points, and drops the mounting point down lower, to correct the camber and caster from the "lift spring"
one of the better dropbracket kits would be the skyjacker kit
I dont see the 2wd listed here on TRS fab, so here is a link to one, to give you a ideal on price
http://www.truckaddons.com/catalog/subpages/skyjacker/skyjacker-ford-45.htm
A "bent beam" kit, is where the factory beams are "bent" to corect the camber from the 'lift spring" and use the factory piviot point's.
like autofab.com econo kit.
since they look to be a wash in price, myself I would go with the autofab kit, just in case you ever decide to beat on it or even get the bug to build off of it.