for budget, go for stock like kayaba or APM standard.
last january my friend bought secondhand satria 1.6, then she sent to the
workshop, to change 4 abdsorber they charge RM 460 including workmanship
(that time have promotion).

but i recommended if u want extra comfort,
go for MONROE sensatrax absorber,
the price a bit higher like 20% more than the kayaba.
combination of gas+oil system
summore it will provide 1 year warranty (in case of leak etc)

if u want to cut mo cost
go buy the abs at spare part shop,
then ask ur mechanix to fix it for u.