since the best graphics card offered is a r9 270x, you dont need an i7 or a z87. something like
i5-4440
any motherboard with a B85 chipset would work.
EVGA SuperNOVA 750 B2 Power Supply
two r9 270x's.
along with (i guess) 500 GB 840 EVO SSD
Corsair Vengeance Pro Memory Kit - 8GB
and Cooler Master HAF 912 Advanced Window - Black.
now take into consideration, this is not the best configuration you could get, just the best you could get from that site
consider finding a mailing address (say your work place or relatives home) where you don't have to worry about local thefts, in order to make a better configuration.
EDIT: go with the z87 it has more pci slots for better crossfire