I am 5'9 140lbs, I have never ridden a dirt bike before but I have rode atvs my whole life. I can't afford a big bike and I like the looks of pit bikes better. I am looking at a SSR 150TX right now. It is $1659, which is quite a bit of money to spend on a hobby that I am unsure on. 1. I know top speed isn't the only thing that matters. But I was wondering how fast can I expect to go and how quickly will I get there? 2. Are they easy to get used to and how do they handle? 3. Are they easy to maintain like an ATV? 4. If something breaks are there replacement parts readily available?