For something like this, I think that it's worth spashing out a litttle more cash, I mean, you paid some decent money for the laptop right? Don't you want to protect the computer? This usually means keeping it safe and secure: I like Tumi as a product - good quality, execellent zippers, lifetime guarantee, looks professional, etc.
So, I went looking for a Tumi at some bag shops here in Munich after having had a look on their website (
www.tumi.com). But, they were huge, bulky and expensive.
The woman helping me suggested a german manufacturer called Offermann: leather, stylish, pratical, computer/backpack. I bought this one for (glup) 160 EUR, but have been really happy with it. Since 1 yr now, I've been using it back and forth work and home and am very happy. I throw it on my back, and ride my bike with it...
Try in the Teatinerstrasse, I forgot the name of the place, but it's in the "Hof" where many store are inside...