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I just recently (like a week ago) purchased a new rig, it's a little... several generations behind but still fairly powerful.
Specifications:
OS: Windows 7 x64 Pro
Ram: 16GB DDR3 1333
CPU: Intel Core i5 2500k (Stock clocked)
GPU: Gainward GTX 570 Phantom
HDD: 1x 64GB SSD Boot Drive / 1x 2TB HDD
I was just wondering if it would be worth (right now) swapping it's mobo for a LGA2011 socket, swapping the 2500k for a 3930k and changing the gtx 570 for a 680?
Considering that I use this rig for video editing and gaming (1920x1080) ... would it be worth the money right now?
I'd say go ahead and do it. You can never have too much power.
And, I'm such a nice guy, I'll take care of all those extra parts off your hands, no charge. Just ship the mobo+CPU+GPU combo to me & I'll handle it from there.

The RAM is pretty ancient, so don't let that bottleneck your performance. Upgrade that to 4x 8GB sticks of 2133 for 32 GB total. Make sure your mobo can tweak & overclock that and you should be able to run it at 2300 or better with CAS down to 11 or so.
In fact, you know what? That looks like a pretty small boot drive. Only 64 GB, I expect you're going to run out of room for games and video data. That can barely contain the OS.
Probably consider taking that up to a 180 GB or 256 GB SSD. Make sure you get a SATA III to take full advantage of the speed. Consider getting two of them and putting them in a RAID 0 config. I've seen where some people do that and get around 1000 MB/s throughput. That will really boost your system performance, especially with that new mobo you're looking at.
If you have no other use for that RAM and the old SSD, just throw them into the shipping box with the other junk. No extra charge.
Seriously, the system you want to upgrade is more powerful than my best three systems. Combined. If you really want to upgrade, I will take all your leftover parts. Just PM me. No joke: I'm desperate to upgrade at this point.
As far as performance boost goes, the other suggestions made so far are all worthy. Upgrading your SSD to a pair of modern SATA III 120 GB or 128 GB drives in a RAID 0 will cost you less than your proposed upgrades and grant you all the performance boost you should need.
You would have to be doing a
lot of video rendering to make an upgrade worth the time you would save, and you would have to be playing intense, cutting edge games at extreme resolutions on triple monitors at tournament levels to really
need an upgrade at this point.
As much as I want all your spare parts, learn and use this system to its capacity for a full year, including the overclock suggestion. Then look at the available gear for upgrade/replacement in April 2013. it will make all your current options look anemic.