I want to add Sorter drop down to my result section in the front-end

I have a search form in a div section on the top of my page
I have a custom isotopic result section on the bottom of my page
http://dev.metropolitan.realestate/plan_types/rent_properties/

Now I want to add a new section on top of the result section where I can put
– Sort by Price Ascending
– Sort by Price descending
– Sort by Custom field Ascending
– Sort by Custom field Descending

In general I want to add Sorter drop down to my result section in the front-end that the end user can play with to change the grid sorting and ordering

Thanks
Ahmed