nola..i tell u wat bro..go buy a wave 125..enugh speed for u to work and wont makan fuel 1..
u're working ma...wan so fast for wat..?right?
plus ur budget jus 4k..so jus forget about fz belang or 250r..
and wan save ur fuel money...forget about 2 stroke bike..

wat i suggest is..
go for wave 125 or lagenda..nice bike for work..and some speed..
price around ur budget too..