Eclipse Lv 4 -- Cooling and Power Adequate?

Hi folks,

I'm considering getting my first computer from DS after 4 years of yeoman service by my current OEM computer. One of the reasons why I am looking at DS is because I think I get more bang for my buck than OEMs, and from the looks of pictures online DS seems to be more disciplined and organized with internal cabling and the like.

I'm looking at the Eclipse Level 4 -- I'm absolutely astonished by its form factor and what specs it has on offer for that size. What I want to know is if it's too good to be true. It's brand new and there are not a lot of reviews on it, but I was hoping somebody here would know.

My concerns:

-- 400W PSU seems a bit low, though the page says that it is rated to support the GTX 970 that the Lvl 4 comes with. Will it also be able to handle the demands of the SSD/HDD combo that it comes with? What about external peripherals? I generally have my computer connected to: one gamepad (Xbox controller or joystick), an external bluray drive (2xUSB, though it has an external power adapter), and one or two external HDDs (external power adapters)?

I don't think external HDDs or bluray drives use USB for anything other than data transfer, but I just wanted to make sure the PSU on the Eclipse Lvl4 was adequate for my needs.

-- Is the cooling and airflow adequate? There's not much room in there, though I do notice that there are separate side vents for the GPU. Basically I want to know if I can work this thing hard and if the cooling will be alright. The 970 is a hefty card, and it looks like the Lvl4 has OCing as well -- gotta be some heat demands there. Is the structure of the case adequate for that?

-- Finally, upgrades. I don't plan on doing much upgrading, especially as the system seems "budget future proofed" for at least two or three years. I tend to hesitate at messing with computer innards, but just in case I wanted to upgrade the GPU or something: how difficult would that be? It looks like it's hidden behind there.

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Something like the Vanquish II is more along the lines of what I'd expect in terms of case space and power for a computer of its specs, but the lvl 4 Vanquish is 100 dollars extra and I don't think I can do that. I'd seriously consider the Vanquish II lvl 3 over the Eclipse lvl 3, but basically what I want to know is: are my concerns unfounded? Or is a Vanquish a better bet? (if so, I'd probably just go with a Vanquish lvl 3 instead).

Thanks!

What do you mean by 80% and 90%? The only percentage figures I am familiar with as far as PSUs go is how wall measurements of power draws are higher than what is actually being required by components due to inefficiencies in PSUs or whatnot. But I don't know what the 80% and 90% figures you said are referring to.

Speaking of full size motherboards and features, is there a problem with having a smaller motherboard? I am looking primarily to use the new computer to game, but also to use standard browsing/word processing functions in the meantime. Should be more than adequate for that, no?

Finally, what is a COTS chassis? I googled the term, but all I could find is references to military computers.

Thanks for the help!