ask yourself the question "how will i feel if i lose 250?"
if the answer is a bad one then maybe dont try it but if the answer is a good one go for it.
otherwise you could continue to play your normal games and whatever you may profit from these put that money to one side and once you hit 250 give the big game a crack, if you lose oh well go back to the local games and continue to do well in them and go back to the big buy in again........ surely if you are able to do that eventually you'll have a good run in the 250 buy in
whatever you decide good luck