2nd hand bikes are just used roughly bikes and driving style depends but you should also have experience in checking used bike otherwise you will end up in buying more money attracter .......if u dint have take someone experienced with you ...
and about 180k budget roadprince bike wego or derbi is also good but parts are nowhere to avail commonly...if you live in big cities you are good to go .... otherwise search for your taste in that budget sonmetimes 150cc suzuki are selled as bobber style may be you like them.............