Get the I/O play with it and when you know a little more about what you want pass it on and get something else. I'm a straight inboard man. I've had the I/Os and an outboard or two but when I decided it was time to get serious I got a serious boat. But now we ski and board hard from early season till after other folks have put up their Christmas lights.
Chicks are gonna party in any boat their bikinis land in.
As far as performance goes well that depends on what your definition of performance is. I'll take on most any I/O out of the hole to 40 mph. I'll also take them on in a handling and turning contest. True I'm not going to hit 60 mph but then again who really needs to? If there are white caps on the water an I/O is a better choice but then again if its like that I'm going to do something else.
My boat doesn't have a grill or seat 13 like a pontoon.
Just remember when Chevrolet wanted to put the Corvette on the water They chose to do it with an inboard.
http://www.malibuboats.com/boats/corvette
And no I can't afford one of these but a man can dream can't he.