Well, for 1.5k you can play just about any game you want on ultra. 10 years of that is highly unreasonable, though. If you look up Moore's law, it states that the number of transistors on integrated circuits doubles every two years. This is slowing down due to the limits of silicon, but in 10 years, there will be huge changes, and a 1.5k build today will not be worth anywhere near that. It may run games then, but not well. As for lasting that long, you cannot guarantee it will last that long. But that doesn't matter, because you cannot future proof that much, so I'll help you with the best build you can get today.
http://pcpartpicker.com/p/36BXv
This has an amazing processor, it will last you a long time. Normally I would suggest an i5 4670k, but the 4770k will offer some longevity. It has a 1tb harddrive, and a quality SSD for a quick boot and all that. It has one of the most powerful GPUs available today, a nice motherboard, and a closed loop cooler so you can overclock. It also has a nice, high quality case for lower temperatures and nice looks. The power supply is a high quality 80+ gold, which means it is efficient and will last you a while.
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