Suggestion needed to match the scenario with the Design pattern

Hi,
i need to know which Design pattern best suits for the given scenario shares management system that enables its customer to buy and sell shares.its current rates of Stock exchange using a line graph or bar graph should synchronizes with the stock exchange rates

on the below given patterns i knew Observer & Template Method Patern is not suit with the Scenario. in my point of view it should be View Helper Desgin pattern
but any help in here would be appreciated

View Helper Design Patter
Dispatcher view Design Pattern
Observer Design pattern
Template Method Pattern

Regards
Mano

The selection of potential object-oriented design patterns is based on a comprehensive set of technical requirements. They are not selected using a general description of an application, a scenario, or any specific targeted feature.