Need expertise before buying a first low cost 3d printer

[alphabravo27]

Hi guys,
seems like there's a lot of 3d printers fans here.

I'd like to take the step and buy one. As I don't plan to make any professional uses of it, I will most likely be satisfied with a cheap one.
I've been digging through forums and webstores and concluded that the I3 Prusa model is the one that meets my curiosity and basic requirements(quality, price, building size). In addition, the design is open source which is a good thing as there sure will be an active community around.

Now, I need your help to pick one from the various implementations of the design available on the internet.

Two models drew my attention and are sold on the famous and very controversial Aliexpress :

That first one : I saw a guy on youtube who recommended it, looks good and to be of quality :
http://aliexpress.com/item/3d-printe...OrigTitle=true

That other one that has a lot of positive votes and is way cheaper :
http://aliexpress.com/item/Black-Fac...OrigTitle=true

My question is : have any of you bought one of those two models and / or can gimme advises or suggest any better option ?

I'm aware those are kits and need minimal skills to get assembled, but that should not be an issue.

Besides, I'm a Linux user (Debian), are there any specific troubles I should expect ? Otherwise, I will manage to get an extra computer with some Wincrap installed.

Thanks for reading

Edit : I could read it's possible to upgrade the printer with 3d printed parts to make it more robust.