Lol, LAN-friendly full tower...my PC is 60 pounds, and I only have one hard drive. If you want LAN-friendly, don't buy a Fractal Design case because these things are heavy.

But yeah, definitely go X79. It has all the upgrade potential you'll need for likely the next 4 years, barring some major revolution in CPU architectures and software design. Also, it's really not any more expensive than Z68 at this point; there is literally no reason not to use X79. $250 will get you a great board on either platform, and the i7-3820 is about the same price as the i7 2600K.