Right now I can see how 8gb of ram will be helpful for me but the cost of 8gb of ram is what concerns me an doesn't make it worth it.What exactly are you doing that would require you to need 8GB at this very moment? Or in the future?
I have 12gigs of ram on my macpro and it's crucial that I have this much ram for the work that I do(video editing)
I will have photoshop, final cut, color, afterEffects, Protools open at the same time and believe me, the ram does help.
My argument is that by the time the prices for 8gigs of ram for my laptop becomes "affordable" I'll probably be upgrading my laptop by then anyways.