I would have to agree with alot of what has already been said, first that sounds like a good deal for the 125 if the bike has been maintained and is not going to require alot of cash to get it up to par. Second if it was me and I was dead set on a 2-stroke I would go for a 250 with the benifits being more torque and smoother power making them easier to learn on and in my opinion. 250's are not as hyper-active as a 125, plus when you are ready to us it all the speed and power you want is waiting for you, however 125's can defenitly fly they are extremely quick and light making them a blast to ride! The simple fact is 125's will require more work than a 250 as you will end up slipping the clutch and reving it alot more than a 250 in the same circumstances, making ridding alot busier and replacing parts more frequent, don't let that deter you too much as parts are not usally too expensive for Japanese bikes, just keep the gearbox oil fresh and the air filter clean (and oiled!) and what ever else the manual recommends, to prolong engine life. If you have your heart set on a 125 check out my link (or shamless plug) below as I am selling mine! I happen to be more of a four-stroke guy......