Over the years I've upgraded from a doughnut style bellyboat, to a fishcat 4, to an 8ft pontoon, to a 10ft pontoon to a 12 ft aluminum. I usually go on 10 day lake trips every year, by about day 5 you start to get picky about all the little things....
The number one reason for the change is mobility provided by an outboard or trolling motor. Nothing is worse than kicking or rowing all the way across the lake to where your buddies are only to get there and have them say "it sucks over here, we're going back to by the boat launch".
Another advantage to an aluminum boat is the superior boat control allowed by a double anchor system. Pontoons are ok, but you'll constantly be correcting yourself in the wind.
Comfort is another factor that cannot be overlooked. Having a roomy boat to stretch out in is by far more comfortable than being trapped in your seat for the day in your leaky waders.
Its also nice to be able to take out a fishing partner for the day.
With that being said, I would recommend something similar to a Lowe 1032 or equivalent. If you have the money go for something like a flyfisher.