The 120 will be heavier, and more powerful, 68cc. It's a great saw. 225 isn't too bad, they sell for 150-180 usually on ebay, but you won't have to pay shipping if bought from the dealer, and will be able to run it and see it. Maybe you can get it for 200. It's a tough, powerful saw. A little behind a 440 in power, but it gives up 3cc.
Scott