Manu - I will mention this since you have owned and ridden the old iron engine bikes. Have you tried the Unit Construction engine (UCE)? Do you understand that the Bullets are no more the bikes which can easily be fixed by any roadside mechanic or even by yourself if you know a little bit of basic mechanics?
And yes, the UCE grants you more power, more punch and more fuel efficiency at the above costs. Simplicity, basically. And thump too. I have noticed that for some reason, even with a retrofitted silencer, you dont get the thump that you get with well broken in iron engines.
Do consider these factors when making your decision. I do admit that it is tempting to get the 'Classic 500' as it is named. But the point is it is not 'Classic' in anything but the looks
.