Boat Hire Website - Building on the existing web design

This is what BHS Boat Hire Sydney was looking for in their web design

Boat Hire Sydney connects boat owners with people looking to charter a boat for their next big event.
There are now over 30 boats to choose from, so I need a nifty filter system to instantly reduce 30 boats down to a small number, based on some user preferences.
I want to use Ajax or similar so that the collection of boats instantly changes in front of you, rather than reloading.

Here is the page we are working with:
http://www.boathiresydney.com.au/c/all_boats

The page should not look drastically different to every other page on the site, so I suggest keeping the entire header section and the blue background but I'm open to ideas.
Your goal is to add dials / gauges / filters / input boxes or whetever way you can think of to allow the user to filter the list of suitable boats for them.
The attributes they can adjust are:
1. Number of guests (overall max is 400)
2. Budget (not exact figures, more like Luxury, Mid-High Range, Mid Range, B… Read more