This is a mid-range system. High end is usually defined by enthusiasts by hardware costing over $2000. An example would be...
i7 4930k, GTX 780, 16 GB 1866Mhz RAM, X79 Board, Water Cooling, 250GB SSD Which would cost about $2000
However if this system is strictly for general surfing, High end is $1000 and up.
Keep in mind this is a matter of opinion and argued by many people.
Also remember that hardware like the Titan exists effectively making an extreme market too.