Toshiba make their own chassis's just like Asus do. There was a time when Asus made chassis, then sent them to local retailers to assemble. I had built quite a number of Asus laptops, and found them better than your run of the mill non-branded chassis, but the top shelf stuff has always been IBM/Toshiba who do all their building in-house.
It's only recently that prices of IBM (Lenova) and Toshiba laptops have come down. Up until this year, sub-1000 dollar Toshiba laptops were unheard of.
I'd go for Toshiba personally, but i'm not a huge fan of their design. Recently i've been purchasing Dell laptops for our workplace, who has slowly migrated from Toshiba laptops. I've had no problems with Dell so far, and their top end lightweight gear is actually pretty bloody awesome, so much so i'm considering buying one for myself.
All the best with that mate.