Ultrabook for a developer

Hi All,
I am looking for a light/thin/small ultrabook that would allow me to work outside home whenever possible :) At this point I'm using a desktop PC but would like to migrate toward a laptop/ultrabook. I am still planning to use the displays I have while working at home (I am about to buy the ultrabook together with a docking station). The main factors I am interested in are:
-> hardware:
- SSD is a must be
- 4GB RAM is a minimum, 8GB is optimal but for sure I would like to have a possibility to extend that to 12-16gb)
- CPU - i5 at minimum - thinking about i7 (is it worth?)
- unfortunately, in most of ultrabooks there are xxxxU CPUs which are not upgradable; I was looking at xxxxM but they seem to be more power conuming - I would be grateful for your opinion about this as well;
- matt display is a must be (I would like to be able to work in the garden)
- battery - as durable and long lasting as possible :)
- resolution - I was looking at 1366x768 - I assume it is less power consuming than 1920 x 1080 but at this point I'm more into the 1920 x 1080 as it will make the work easier (IDE etc.) - are there anyone who disagrees? :)
- price - not more than 1500$
I think that's all for the introduction. Now the options I gathered so far (unfortunately I do not even have an option to compare them visually):

Toshiba Portege Z30-A-19L
Core i7 4510U / 13,3 Full HD / 8192 / 256 SSD / Intel HD 4400
316x227x18 at 1,2kg
pros:
+ seems to have the longest standing battery
+ there is an option to buy it with i5 (4210U) in case it is not worth to spend additional money
+ overall hardware config seems to be ok
+ RAM extendable to 16gb
+ small/thin
+ light
cons:
- no option to upgrade CPU in the future

Toshiba Portege R30-A-71B
Core i7 4610M / 13,3 Full HD / 8192 / 256 SSD / Intel HD 4600 / DVD
316x227x26 at 1,5kg
pros:
+ DVD can be replaced with additional HDD
+ upgradable CPU
cons:
- slightly bigger than Z30

Lenovo ThinkPad T440s
Core i5 4210U / 14,1 HD+ / 12288 / 256 SSD / Intel HD 4400
331x226x21 at 1,59kg
pros:
+ warranty is 3years compared to 1 year in Toshiba
+ thinner than R30
cons:
- more expensive for similar hardware than Toshiba (that's why I put the i5 option as i7 is too expensive)
- bigger than R30 (width)
other differences:
? lower resolution
? bigger display

Unfortunately, it is difficult to compare the batteries :/

I would really appreciate your help/suggestions/oppitions :)

Regards,
Piotr
 
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