Firstly, do you have a local club you'll race at ?
What is the most popular class there, 2 or 4wd ?
What surface will you primarily racing on ?
People will be recommending the cars they like to you until they've all been mentioned
Some stores don't appear to list the Hobao H2 Pro anymore so I'm not sure how good future parts supply will be...
Out of the major manufacturers, there aren't really any 'bad' buggies. Always a good plan to run what others do at your local club, both for set up advice & trackside spares.
Secondhand can work so long as you don't buy something with worn parts that you'll need to replace otherwise you may have wished you'd bought new. Another benefit of a new kit is you'll learn how to work on it as you built it !