first off dont be so single brand orientated. if you compare multiple brands you will manage to build a decent pc inside your budget.
also for your budget you may be better off going amd unless your interested in K part intel chips and z series motherboards for overclocking.
look on pcpartpicker http://pcpartpicker.com/parts/partlist/
start with the motherboard, remember it doesnt have to be built from just 1 brand. parts like memory and gfx cards are interchangeable and compatible.