dat,
There are some many endless options and opinions on boats for every application under the sun.
In terms of material, fibreglass will generally give you the smoothest ride but more maintenance and care is needed to keep it in tip top shape. Aluminium has come along way with some hull design able to perform as well as their fibreglass equivalents. Aluminium is quite hardy and durable, lighter and generally cheaper than fibreglass. I have little info on poly boats but I know of many members who own them and they could not speaker higher of them.
Some things I have noticed are; fibreglass boats are generally nicer fitted out than aluminium boats but their higher cost would obviously influence this.
Some aluminium boats you could look into are Quintrex, Stacer etc.
Some fibreglass boats could include Haines Hunter, Savage? etc.
Some poly boats could include Polycraft etc.
Do some research using some sites such as www.boatpoint.com.au or the Trading Post to find out some prices on your desired length etc.
Look in the Sponsors Section of the site to see Huey's boats of the week to see some quality boats that may suit you.
Where will you be operating the boat (i.e. inshore, offshore, bit of both)?
How many people do you want to carry?
Are you keen to stay overnight?
Do you need shelter from the elements?
Do you want to ski, cruise as well as fish?
Boats are generally expensive and you don't get a lot for your dollar so be prepared to reacess your needs to suit your budget!!!!
BOAT= Bring on another thousand!
Elliot