Thank you for the feedback. Question though, is 4G RAM not too little. I am not that familiar with the difference b/w DDR2 vs DDR3. Is 4GB DDR3 like 6GB DDR2 if you were to draw comparisons? The reason I ask is that majority of the time I have photoshop, illustrator and other CS4 suites open simultanteously and designing say large posters with lots of images it takes about a lot of memory. I actually wanted to get 8GBRAM, but I cant afford.
I would start with 4GB of RAM and save up for another 4GB of RAM... IMO 8GB is going to be your sweet spot for your needs!!
Running 6GB will not function well unless you plan on purchasing a 4GB (2x2GB) and 2GB (1x1GB) sets, which will work based on your needs. Also, you have to remember, you are going to gain more CPU computing power with your new system, so that will help with your load / processing times.