For $150 definitely go Roll Bar especially if Richard will hook you up with the mounts for free or cheap! It will free up a lot more space than a universal Pylon.
I have the Skylon Pod (Paid like $300 or so?) and it is killer, but it definitely takes up space and the side support poles really get in the way.
Check it out.
By the way...My boat is for sale...If anyone is interested, e-mail me!