250 is ok for starting..
If you planning to upgred.. better get 2nd bike, cheeper. please make sure the bike is in good condition.
if you want to go fast 250cc is not fast/power bike!

cbr250r,ninja250.. these to bikes easy to get in the market.
cbr more to sport touring, ninja supersport
diffrent riding position...
to save money do check motor condition, tyre, chain, spoket, break, body crack or any have accident
do spent on safety gear.. fullface + glove + jacket