Thanks for the reply Mark:
I was thinking about switching the mother board to this gigabiyte board:

MOTHERBOARD: [CrossFireX] GIGABYTE Z87-HD3 Intel Z87 Chipset DDR3 ATX Mainboard w/ Ultra Durable 4 Plus, 7.1 HD Audio, GbLAN, 2 PCIe x16 (1 Gen3, 1 Gen2), 2 PCIe x1 & 2 PCI (Pro OC Certified) [+13]

However...am I understanding you correctly that because it's "crossfire" it will not be capable of adding another GTX GPU?