How to create product bundle or similar to that? I have a plan to create a e-commerece website for Computer Assembling. 
I have exp in Prestatshop and few other CMS (e-commerce) framework.
In that i found Drupal 7 is having the best one like durpalecommerece. So I selected Drupal 7 as CMS framework.
I download few modules ubercart and tried e-commerce module also.

But its not meeting my requirements. My requirement is 


Homepage - User can see All default PC set (Monitor, CPU, Keyboard and Mouse) with price. 
Select PC, Next page description will display.
Defualt Product piece is 1, but the user can increase more.
Based on the increase Rate will be changed.


Above steps are working fine. Below steps are not working.


Homepage - If user doesn't happy with default PC set, User can build there own PC
Select "Build own PC".
List of Monitor companies and inches will display.
User selects one monitor and click, 
It will redirect to CPU Parts.
User will select Mother board, ram, hardisk ... one by one
On click "NEXT" redirect to shopping cart....


How to achive Product bundle here to get calculate amount in cart
For building a e-commerce website you should try the drupal commerce module or commerce_kickstart (If you are novice with drupal then commerce_kickstart is the option).
Drupal Commerce 


  Core Features
  
  Create product types with custom attributes
  Dynamic product displays
  Order management, line item
  Payment method API, allowing many different payment gateways 
  Tax calculation / VAT support 
  Discount pricing rules 
  Deep integration with systems like D7's Fields, Views,Rules and Entity API.


Commerce Kickstart


  Commerce Kickstart is the quickest way to get up and running with
  Drupal Commerce. It includes the latest versions of Drupal core,
  Drupal Commerce, and the other modules it depends on. It also gives
  you a set of options to create a fully-featured demo store out of the
  box complete with an attractive theme, catalog and search
  configuration, and a custom back office interface.
  Who should use Commerce Kickstart? Anyone who wants to skip weeks of
  configuration to build a commerce site on the Drupal Commerce
  framework.