Honestly, I don't know. All the laptops you list have good specs, and I think you'd be happy with any choice you make: all the systems you list would give you a big boost over what your current system is - so I think no matter what, you'd have a smile on your face.
What I'd do is construct a very in-depth list/spreadsheet of criteria that an ideal purchase would meet.
First, select the form factor (laptop, desktop, etc). Select the minimum specs you want. Also include things like warranty and other necessary parts of the purchase.
Then I'd decide on what the price range I'm willing to pay is.
Then I'd construct potential builds on the manufacturer website, and see how the system compares to the criteria.
Now, I'd figure out what compromises I'm willing to make, and adjust the computer specs/price to adjust. If no computer really provides what you're looking for after a few tweaks- then either I'd wait, cast my net wider (to other form factors), or try to sweet-talk a customer service rep . If a computer ticks most boxes, and you're happy with the compromises, then buy it. Don't dither about too much or you'll forever be waiting.
So to conclude - make an in-depth list of your criteria and select what best meets those criteria.
I think you'll find a laptop that meets your criteria now. But if you really are unhappy with your purchase, I should think consumer protection laws in your country give you some protection, and allow you to return the system, though I'm not too sure how it works in your country.
Ok. First of all. There are times which I travel a lot and times which I don't. For example, this last 4 months I've been staying out of my house 10+ hours every day: Between university and going to my grandma's house (I do that most weekends). I also know that I'll be traveling quite a bit in the following 9 months. Dunno after that
1) Screen resolution: Nothing less than 1080p (in case of a laptop). I have a Samsung SyncMaster 2494 and I'm pretty happy with it (in case of the desktop).
2) Processor: i7. Need something that can handle quick 1080p video encoding. (Quad Core or more)
3) Memory RAM: 8GB+ (CAD softwares recommend this)
4) Video Card. Could be a GTX 750 or greater. Preferably a GTX 760 so it can go good with hardware acceleration using CAD, and After Effects.
5) Hard Drive: SSD will be too expensive. I don't need lots of space, I have external drives which I usually throw the data there. But carrying less than 320 GB (I would struggle a lot with 256 GB) with me is a must no.
6) Warranty: To be honest I'd pay for good warranty, as I did for my current Laptop. The thing is, that I won't receive good support from other manufacturer than Dell. By living outside the US, it takes me 50$ to ship a single pound to it . So I would have to wait for someone to travel back to the US in case something came off.
7) New Keyboard + Mouse combo.
Price Range. Not over 1600$.
Thanks for the tip!