I came across this and thought I'd pass it along in case anyone is looking for a reasonably priced set of coilovers.
http://www.ebay.com/itm/KW-V3-Coilovers-WITH-Maximum-Motorsports-Camber-Plates-S197-Mustang-05-10-/271813874840?fits=Model%3AMustang&hash=item3f495e9498&vxp=mtr
http://www.ebay.com/itm/KW-V3-Coilovers-WITH-Maximum-Motorsports-Camber-Plates-S197-Mustang-05-10-/271813874840?fits=Model%3AMustang&hash=item3f495e9498&vxp=mtr