basically its done nearly 400k and the springs have sagged and the bushes are beyond fucked (origonal bushes ?

what would you guys recomend, its only a road pig so even the sagged height isnt a problem, would you guys just throw in a new set of bushes, if so what type, poly urethane? and how much should a set cost?
or is it worthwhile getting them re-set, if so how much should resetting cost? my brother got his hilux done for about $300 from memory?
or would the springs be stuffed? new springs look to be around the $1000 mark :(
Im not sure how to tell if the springs are stuffed or not, they dont look warne, but theyre definantly sagged. the spaces between the springs ( stop them rubbing?) look to be stuffed aswell.
any advicew would be aprreciated, the process of changing the bushes doesnt look to be too technical however any pointers would also be appreciated.
for the record im no mechanic but do consider myself more than handy with a socket set