Eyefinity upgrade questions

Hello internet! I have lots of questions for you, but I'll try to keep it short and easy to read. As usual, sorry if this is the wrong category/sub-category, I couldn't find any better ones  

So here's what I'm trying to do:

Currently I have a 24 inch LCD monitor at 1080p resolution and I've decided that I want to upgrade to three monitors! But, of course, there are a few problems.

The first problem is; the monitors I want to buy are also 24 inch at 1080p, however they're backlit by LED. To be more specific, it's the LG E2442V I'm going to buy. So would it look weird if I mixed LED and LCD monitors? What's the worst case scenario? That I have to adjust the brightness and sharpness levels, or is it just going to look like an uncontrollable circus?

Second problem/question; To use three monitors at once, I can't use DVI, HDMI and VGA on more than two monitors at once (which I know thanks to HugoStiglitz). So I'll need to use a mini displayport to connect at least one of the monitors. At first, I looked at an adaptor from Kanex, it looks like this:
(the site is Swedish, but you can still see the picture of it  )
http://www.prisjakt.nu/produkt.php?p=762651&o=inkfrakt

But if I was to buy that one, I'd need to buy cables too, which now seems like a waste of money. Instead, I found this thing: https://www.deltaco.se/menu/295/296/products/categories...

It's a three meter long HDMI - mini displayport cable. However, I need active cables, and I'm not sure whether these are active or passive.

So short story, the question is: do you know if this cable is active or passive? If not, how do I tell? The product specifications don't say that.

My graphics card is an MSI R6950 2gb twin frozr III pe/oc (I've overclocked it to the max). It has two DVI ports, one dual and one single link, one HDMI port and two mini displayport.