You said that this was a bit of a rocket for a first bike, just saying it really isn't that powerful.
Saerimmner is really spot on here, a quality bike is more important than a bike. Not saying you need to spend a fortune, but most of us would say that if you are not capable of the repairs yourself its best to stay away from. A "ignition" issue is a great way to sell a POS bike that needs a lot of electrical work, you will never know till you've repaired the ignition, then you find out it needs completely rewired.
Motorcycles may seem simple but call a shop and just tell them what you are looking at and get their advice, any shop worth anything will tell you that you are looking at more money than the bike is worth. If you plan to spend $1,600 on a bike, get a running one for that price, not one you have to put back together, it gets expensive quick.
And NEVER buy anything you can't hear run!!!! You might as well take your $600 buy a big bag of weed and smoke it all to your head, then at least you will have gotten something for your money rather than a headache.