I've been riding dirtbikes almost my whole life and recently began riding some of my friends motorcycles. I'm planning on buying one soon but I want to get one that is easy to learn on but that will still be good for me once i gain some expereince on it. I'm looking to buy used and hopefully get something that will last a fairly long time. Since I'm experienced at riding bikes I'm leaning towards a 600cc bike, any suggestions would be appreciated.