Help selecting Buletooth Module

[racksmey]

I want to purchase a Bluetooth module that can program the Arduino Mega 2560.  I would like for the module to able to be used with the two shields that I purchased, links to the shields are listed below.  I know that I can use a Xbee product, but there are so many to choose from I am unsure of which I should get.  Also I don't know if a Bluetooth device or Xbee would be more efficient. 

The price range that I am willing to spend is up to 50 dollars, but depending on the device I may be willing to spend more.

Xbee Shield
http://www.sainsmart.com/sainsmart-xbee-shield-module-for-zigbee-arduino-uno-duemilanove-mega-1280-2560.html
Sensor Shield
http://www.sainsmart.com/sainsmart-sensor-shield-v5-4-arduino-apc220-bluetooth-analog-module-servo-motor.html

[zaxarias]

What is the distance range you want to achieve ?

[racksmey]

The max distance that I would need is 12 feet, but anything greater would be appreciated.