The kit is definitely the way to go for a first time builder. You will be on the road much sooner because you have far fewer potential problems to solve with a kit.
A definite difference in buying from EBay or an on line site like our sponsors is the service after the sale. If your EBay kit arrives damaged or inop, the EBay seller may or may not help. The on line vendors like our sponsors are far more likely to help in those situations.
The parts that can broken in shipping are usually the plastic ones, like the throttle, air cleaner and ignition box.