Well I agree with most people on this thread, do not top it. From what I have been told and read, and through experience, you can start topping at the 4th true node through the 1st week of flower. Outside of that, you will stress her too much and growth will be impacted.
As for your height, it's not really so much that you just vegged it for long, since 6.5 feet is quite high. I think that mainly it is the lighting. If you are using flouros, the light output is WAY lower than that of a wattage equivlalent of an HPS or MH. The lower light stretches them out. I grew under flouros for my first 2 grows, and my plant looked like yours, not that it's bad really, they just could have SOOO much more bud. Also, consider the strain. If it is a mostly sativa then you can expect height like that at maturity.
Maybe for your next grow, just try a 400W or 600W HPS, and I bet you will see a HUGE difference. They aren't that expensive either, look at htgsupply.com, a full 600W HPS setup is only 200$ !! Looking good though, have fun at harvest!