For the kind of money you'd be looking to spend, you'd be better off taking that money, selling the boat and combing the cash for something like this:
http://www.boats.com/boat-details/Fount ... /111758401
There's no aft cabin, but it has a v-berth, some seating and a porta-pottie and a 70+ MPH top end.
Boating is an excercise in compromise. In General: Cruising boats don't make good fast boats. Fast boats don't make good cruising boats. Neither make good fishing boats. Fishing boats tend to be limited in cruising (at least when comparing the livibility of a fishing boat vs. a cruiser of the same size). To get into a boat that is good for crusing and fishing, then cost and size tends rise. Convertables meet this goal well, but they're rarely fast. To get a very fast fishing boat which is also sizable for crusing and the price thends to shoot through the roof.
I would love a fishing boat, but I own an express cruiser that is basically unfishable. However, I don't want to boat alone, so I compromised on something that both the wife and I can enjoy together. I see this alot. Someone buys a bowrider, but wants to fish. You can pull the kids in a tube on a walk-around, but are limited with a bowrider in regards to fishing.
No offense, this is life. Many, many people need to go through several boats over a number of years before they really find the boat they want. This won't be my last boat and there are many things I'm looking for in my next boat. When I get that boat it will be perfect.........................until I use it for a while and realize the things I want or need that I didn't consider. Then I'll add that to the wish list for the Next boat.