Weight isn't really ever an issue, even when it comes to laptops with me. My first one was a monster, and weighed enough that the newer stuff really doesn't bother me.
As for the laptop or desktop debate, a desktop is out of the question. I haven't the space, nor another desk for a desktop. Normally I've got a cooling pad on the end of the bed and my lappy. I've got about three years of both IT schooling as well as some IT tech work under my belt, so I know what I'm after for the most part (gamer as well).
I'm gonna take a look at the Asus ROG line here in a few minutes. I've heard of the brand "Asus" before, but never really put stock in the non-advertised brands. Still, never hurts, especially if it saves my bank account. Thanks Legion :)