who needs 8gb, sheesh. i barely use 2gb of my 4gb of ram as it is. even using photoshop, I have never seen it max out.
Have you ever tried video encoding before? Take a massive BluRay rip and convert it to MP4 H264 format with multiple passes and see if you can browse firefox with allot of tabs open. My MBP is my main computer so it needs to be fast...that said an SSD is another option.