I wonder if there is anyone in the business of acting as a buyer's agent
I dont know if such a thing exists, I haven't heard of one but that doesn't mean much.
The best buyers agent is probably yourself. Get around and talk to a
few LAME's, most of them are smart and dont (unlike myself) own an aircraft so they have no particular biases.
Good luck in your quest.
Just one other thing to consider, do you really like aeroplanes and things aviation or, do you just like flying. If it is the latter then definitely keep renting. You must be honest with yourself here because you will find that owning a private aircraft will chew up
much more
time than that just spent flying.
By the way, A Bo is definitely NOT a 6 seater if you are talking adults and any more than an egg cup full of fuel.