i wouldnt recommend the yamahas... their clutch is what was known as "clutch hidup" back in the day.... meaning u can actually use the bike without the clutch like stopping at red light in first gear n no need hold clutch.

suzuki RG Sports had "clutch mati" so its a full on proper clutch which will kill the bike if its in gear at a stop.

i think an FZ150 can get cheap now. so perhaps look in to that.