im assuming ur budget is limited since ur considering the RS3.... if u have doubts, get a used kawasaki ninja250 or Z250 instead then. the parallel twins. they have been around for so long and proven to be very reliable. plus any issues it had, theres probably a solution for it somewhere out there.

theres also the versys 250 but bike is still new theres no used one yet afaik.

15k n below can get.. depending on model/year/mileage.

like my bike, a first batch 2013 Z250 with about 76k km. id probably sell it for RM11-12k... may even go lower when the time comes (hopefully soon)