At what resolutions do you intend to play? Depending on that you may need 2 or more graphics card. Wait for the new NVIDIA GPUs. This month ata ang release nun.
Also, i doubt there will ever be a set up that can last a good 5yrs. There will always be newer and better products and requirments will only go higher and higher. in 5yrs time I doubt that you will still be satisfied with what you have.
So, my advice is to save your money.. go for highend hardware if you can afford it but dont go over the top.. 2-3yrs down the road, when your rig is starting to show its age, build another rig from the money you saved. That way you will always have the latest and greatest. With 150k , you can use half of that to build a pretty highend gaming machine already. Use the other half for a new build after 3yrs and be happy all the time..