Thanks for the answer.
I'll wait 3 days before order it. So, there is no problems to create a dual boot, that's cool; I've asked this because I hesitate with the alienware and I've read that alot of people can't install fedora, debian or ubuntu.
Last question, I never had a SSD + HDD, so, when i gonna select the drives for the different /var, etc. is it possible to use SSD for both windows and debian ?