Hey,
I'm doing the same with my MacBook. Specs in my signature!
It came with 2GB when I bought it but I upgraded to 4GB not long after buying it in 2008. I recently upgraded to 8GB. You really can't go wrong with updating the RAM. It cost me £50/$87 for 8GB. Right now, it's down to £38/$59 for 8GB.
I see you currently have 4GB RAM installed. My advice would be to forget about upgrading the RAM just now. Why? I haven't noticed much difference between 4GB/8GB. I only upgraded because I had enough money to spare and I wanted to make my MacBook last as long as possible.
If you're looking for improved performance then it's gonna come from an SSD much much more than from RAM. If you're wanting an SSD then instead of buying RAM just now put the money towards an SSD. Leave buying RAM until you've got an SSD and installed ML. The price of RAM will only get cheaper. See how your Mac performs on 4GB with an SSD and then if you still want 8GB buy it for a bit cheaper
SSD's are still quite expensive. A HD cost about £0.20/$0.32 per GB while an SSD costs about £0.61/$0.96 per GB. For a 250GB HD it's ~£50/$78 and for a 256GB SSD it's ~£155/$243. If you don't buy RAM then that £38/$59 will go towards the SSD. Every little helps!
My choice of SSD was the Crucial M4 256GB. Haven't tested it out yet but a lot of people recommend it. I will be installing it in my MacBook after I download ML.
Here is how I'm going about it:
- I'll download ML from the Mac App Store
- Put the installer on a USB drive by following these instructions: Click here!. If you wanted to burn it to a DVD then Click here!.
- Once the installer is on the USB/DVD then remove the HD and put in the SSD.
- Power on Mac while holding the option key and selecting the DVD/USB.
- If you haven't already then format the SSD to Mac OSX Extended (Journaled)
- Once it's formatted then proceed to install the OS!
Hope that helps
Good luck!