Just my opinion- I don't think this hobby is the kind that you can simply build one super robot then be done with it, it takes time to build robots and work on from those mistakes and slowly build up to a really good robot.
If you want to, I urge you to try to build a heavyweight. I have found a lot of people on this forum and some teachers etc. that can suggest things are too hard to do, and I am greatful for their help but I have succeeded in doing them. So don't let them put you off, but be aware it will be tough and like I said you probably will need trial and improvement to make a good robot that doesn't get broken.