you could sell your current mobo, cpu, and memory then pick up this an alendale and a good mobo and you would be set for awhile without breaking the bank. Also you should be able to push your that res more then you used to and allow that video card to last awhile longer comfortably until you want to move to dx10.
Also you should be able to push an alendale better then most with not only this memory but with our water cooling setup at well. I would look for a used alendale though as if you are buying retail you might as well just get a e6420 or e6320 instead.
considering the price I would say go for it.