Are you sure you want to get a 350D it's a great case but with that budget you could get a 650D and a 3930k 780x2 would be one heck of a system and a 860psu should be fine but just get a 1000w just for the peace of mind and do you need that many ssds
I would go with the k70. It's 4 steam games cheaper (yes, that's how I measure my PC money), looks so much better, and is more ergonomic to use with the free included wrist rest. (seriously ducky, $150 and you don't even chuck in a wrist rest?) The ducky is over hyped around here imo. Sure it bends slightly less if you put unrealistic amounts of force into it, but it doesn't look $150. Not worth the money imo. Save yourself some money and get the k70
I probably wouldn't get the Razer Blade if you want top-notch performance. Since it has a single GTX 765M, it will be noticeably slower than my last-gen Radeon 7970M..
A current-gen Alienware 17 with i7-4700MQ and GTX 780M (16 GB @1600 Mhz, and a 750 GB HDD) is ~$2200, and you can upgrade the CPU, GPU, RAM (4 slots), and HDDs (two 2.5" and one mSATA) later if you want...
The comparable Sager NP9390 is a bit cheaper with the same specs, at ~$2000-2100. The NP9390 does allow for upgrading to dual GPUs, which is a feature that the Alienware 17 does not have. (I believe that it also has two mSATA slots, but I'm not sure).. Also, the NP8290 is a good option, though it only allows for one GPU, like the EON-17 and AW17.
When you're customizing it, you should get the best GPU they offer (or two), but you don't need an extreme-edition CPU. The base i7 won't bottleneck the GPU if you're planning to use it just for gaming (also, 16 GB of RAM is unnecessary).
For reviews of the various models, I find that the articles at http://www.notebookcheck.net/ usually have a ton of useful information.