Prop Advice

[Shreddy]

I'm looking to upgrade the prop on my boat and need suggestions for the best alternative. Have a '92 Four Winns 220 Horizon. It's an awesome boat and is big and spacious but not overwhelmingly efficient or fast. It goes as fast as I need it to go (between 30 and 40) and most of the time I'm just putting around slow cruising anyway, but think a lot of progress could be made with a prop replacement. Right now it has your typical 3 blade? steel prop on it. No clue on pitch, etc.

My brother in law has the same boat only a newer model and I think has the volvo engine. His is much faster and efficient, but also a smaller model. His prop is one of the dual blade stainless steel props.

My question is, what's the best enhancement I can achieve for my boat? I'm sure I may be restricted by the outdrive, but would like to know what alternatives are there before I simply upgrade to a 26 foot bow rider. Any advice is appreciated and thanks in advance.