Don't get scared by the numbers. 1200 bandit early models were a bit savage but mellowed as the model progressed. The 600 needs reving to get performance out of it where as the 1200 has more torque from lower revs. 20 bhp difference will be noticable but the extra 30ft/lbs of torque , from 39 to 69, will take the strain out of riding for only a 6 kg weight gain. 5 speed box on the 12, 6 speed on the 600. If you buy at the right price and age you'll have enough left to upgrade the suspension. Your choice then is faired or naked. I like naked, but it is noisey , tiring and you get all the weather when it catches you. And now ,just a word to the wise. Bare in mind that although the CB900 was the bees knees in it's day the bandit 600 will out perform it in all departments. In my opinion a 30 year break means you can't ride any more. Don't go at it like you just need to brush up. You need to learn from the beginning again. Statistically you are in a very at risk demographic. Not said to be critical but we see alot of born again casualties. Good hunting