In my opinion, even if the quality is dropped, but dont oversee the fact that the model you are reffereing is almost 10 to 14 years old.. even if the quality is high, the bike has lived its full life. The second option is new, lets assume the new bike stay in optimal condition for 5 to 10 years, still its better to buy new bike... value for money plus the feel of fresh engine,. What i think go for brand new gs 150se, only if money is not constrain... and as our economy is depreciating every day its better to pay 50% upfront and lease the remaining...