It's an interesting build.
Good choice of CPU - the 2600k's are a great processor.
Your motherboard choice, combined with everything else you've got is a bit of an anomaly - not good enough to cope with major overclock's, but over spec'd for basic overclocking or no overclocking.
Your RAM quantity is fine, but you can safely go for unbranded RAM wthout any noticeable performance hit. It will save you money though. The caveat to this is if you want to overclock, in which case, stick with you Samsung, or go for something like Corsair XMS3
Graphic card choice is good, but if you can free up budget from RAM / motherboard to upgrade, then go for it.....but...
Your PSU looks a little underpowered. I'd look at 800W myself. It leaves a little more head room for future upgrades, especially in the graphics department.
Hard drive is Ok. SSDs are nice, but only if budget allows.
You've not mentioned anything in your post to indicate that the network card is required. Your motherboard choice (and almost all motherboards) have perfectly adequate LAN ports on them.
One more comment....you've not mentioned a CPU cooler, so I'm assuming that you're intending using the Intel supplied cooler. That's fine, but it will limit overclocking ability - that's fine if you don't intent major boosting of performance, in which case you can definitely spend less on your motherboard.