Computer System: RAM

What options do you have? List the amount, type, speed, and price of each option.
What are the differences between the options?
Go back and look at the system requirements for the software you need to be able to run? What's the highest recommended RAM requirements? (i.e. of all the software you specified as being used on your computer, which one required the most computing power?)
Which option are you going to select? Why do you only need the included RAM option and not need one of the upgrade options? or vice versa, why do you need to upgrade? How does that help make your computer a "goldilocks" computer for you - just right - not too little, not too much? You need to strive to be somewhat specific; don't just say, "The included option meets my computing needs."

- I have 5 options
*2GB Shared Dual Channel DDR2 at 800MHz [Included in Price]
*3GB Shared Dual Channel DDR2 at 800MHz [Add $45.00]
*4GB Shared Dual Channel DDR2 at 800MHz [Add $90.00]
*6GB Shared Dual Channel DDR2 at 800MHz [Add $150.00]
*8GB Shared Dual Channel DDR2 at 800MHz [Add $225.00]
- The difference between these is the amount of data they process at once(2GB-8GB)
-Windows 7 64bit requires 2GB of Ram so this would require the most RAM out of all my software
- I chose to go with 4GB of RAM, probably could be happy with 3GB but would like the possibility of being able to upgrade software in the future that may require more RAM. This would be more than sufficient for me. I want plenty of RAM because I open up multiple tasks at the same time and do not want it to slow down my computer.