you can always upgrade
I'd nominate going the 206/206L , good machines, do the job, + all the above comments.
if you're starting out & want to make it work, leverage on the cheap(er) aspects of the Jetty until you are on your feet.
later arrange to take the boss for a ride in a 350/120/130, if the boss is happy with the way things are going but & is willing to spend more, I'm sure he'll form an opinion on the others & considering he wants client focus, then it's up to you to present more figures on them.
you wouldn't go buying a brand new ferrari when learning to drive, nor would you buy a rolls royce if you were starting a taxi company.
I'd certainly like the 350 or 130, but start with something that wil be adequate & economically viable, before over-extending yourself
my 2 cents